NATURE Notes
Every month there will be a new note about what to look for in the natural world during that month.
August - Jewels of the sky
Ruby-Throated Hummingbird
Lovingly referred to as ‘jewels of the sky’, most people have a fascination with hummingbirds. They come in many colors with names like Sapphire-bellied, Honduran Emerald, Blue-throated Mountain-gem, and Ruby-throated. As the only regular hummingbird found east of the Mississippi River, most of us are familiar with the Ruby-Throated. The striking red and green coloration, make the Ruby-Throated hummingbird a beautiful sight to behold. The red feathers appear on the throat or the “gorget” of the male Ruby-throated hummingbird. As with many species of birds, the males are more colorful than the females. If you manage to get close enough, you may notice that female Ruby-Throated hummingbirds have a single red feather on their gorget. Male hummingbirds use their bright red gorgets to attract potential mates. These beautiful birds are Minnesota’s smallest bird and only hummingbird migrant.
Hummingbirds get their name from the humming sound they make when they fly. These little birds move at an impressive speed, moving their wings at about 60-70 beats per second. It is said that they can fly at speeds of up to 35 mph! They move so fast that many people only ever catch a glimpse of them. Since hummingbirds fly in a similar pattern to insects, they are sometimes confused for larger insects and moths. Many moth species in the genus Hemaris, are called Hummingbird moths because they are often seen flitting around from flower to flower in search of nectar.
Ruby-Throated Hummingbirds are migratory visitors to Minnesota. Spending the winter in Mexico and Central America, they migrate to Minnesota in early Summer for their breeding season. By mid-August, Ruby throated Hummingbirds are starting to prepare for their journey South. There are biological and environmental triggers that spur hummingbird migration. Changes in sunlight and food availability signal that it is time to migrate. Before migration, hummingbirds will molt their old feathers and pack on extra weight to prepare for the long and tiring journey to their winter grounds. A hummingbird will double its body weight in order to complete the 3,000-mile trip from Minnesota to Mexico.
In the summer, many people enjoy putting out feeders to watch these little birds in action. Those with flowering pollinator gardens will also attract hummingbirds. Native plants with tubed, funneled, or cup shaped flowers, are especially attractive to hummingbirds. Popular choices are Bergamot, Cardinal Flower, Phlox and Columbine. Hummingbirds are attracted to the color red, so red feeders and flowers are a good choice. Even though nectar makes up a large part of their diet, hummingbirds also need protein. They get this additional protein by eating smaller insects. Hummingbirds are not only fun to watch, but they are essential pollinators. It is said that 75% of the world’s flowers rely on insects, birds and bats for pollination. Hummingbirds pollinate flowers in our parks and gardens, adding a splash of color to our lives.
Author: Alison Jennings Teacher/Naturalist Intern
Hummingbirds get their name from the humming sound they make when they fly. These little birds move at an impressive speed, moving their wings at about 60-70 beats per second. It is said that they can fly at speeds of up to 35 mph! They move so fast that many people only ever catch a glimpse of them. Since hummingbirds fly in a similar pattern to insects, they are sometimes confused for larger insects and moths. Many moth species in the genus Hemaris, are called Hummingbird moths because they are often seen flitting around from flower to flower in search of nectar.
Ruby-Throated Hummingbirds are migratory visitors to Minnesota. Spending the winter in Mexico and Central America, they migrate to Minnesota in early Summer for their breeding season. By mid-August, Ruby throated Hummingbirds are starting to prepare for their journey South. There are biological and environmental triggers that spur hummingbird migration. Changes in sunlight and food availability signal that it is time to migrate. Before migration, hummingbirds will molt their old feathers and pack on extra weight to prepare for the long and tiring journey to their winter grounds. A hummingbird will double its body weight in order to complete the 3,000-mile trip from Minnesota to Mexico.
In the summer, many people enjoy putting out feeders to watch these little birds in action. Those with flowering pollinator gardens will also attract hummingbirds. Native plants with tubed, funneled, or cup shaped flowers, are especially attractive to hummingbirds. Popular choices are Bergamot, Cardinal Flower, Phlox and Columbine. Hummingbirds are attracted to the color red, so red feeders and flowers are a good choice. Even though nectar makes up a large part of their diet, hummingbirds also need protein. They get this additional protein by eating smaller insects. Hummingbirds are not only fun to watch, but they are essential pollinators. It is said that 75% of the world’s flowers rely on insects, birds and bats for pollination. Hummingbirds pollinate flowers in our parks and gardens, adding a splash of color to our lives.
Author: Alison Jennings Teacher/Naturalist Intern
Previous nature notes
January - chickadees
How Do One of the Smallest Birds Survive Minnesota Winters?
Black-capped chickadees may be one of the most easily recognizable birds both by their look and by their call: “chicka-dee-dee-dee”. However, did you know that chickadees are one of the smallest and hardiest birds that stays and faces Minnesota winters head on? Most people think about birds migrating south, moving to warmer locations, and living through the winter season in these areas. Have you ever considered how such a tiny bird like the chickadee manages to survive our harsh Minnesota winters?
One of my favorite classes to teach was about birds in the winter. Specifically chickadees because they have some great adaptations to survive the cold winter months. One of the chickadees adaptations is their memory. To demonstrate this to the students, we would take a handful of sunflower seeds and hide them outside before going on a birding hike, then we would have to come back 2 hours later and try to find all the seeds we hid. This activity opened the student’s eyes to how amazing chickadees memories are, because most of the students could not remember where they hid their seeds. Chickadees start to stash food in autumn to go back to on really cold and short days. Having extra stashes of food around is necessary for these birds since they are burning so much energy every day in order to keep their body temperature around 108 degrees Fahrenheit. Of course, their half-inch coat of insulating feathers helps keep them warm. They fluff those feathers up at night to fill every inch of their roost cavities to keep out as much wind as possible. The most amazing adaptation is the fact that they have the ability to go into regulated hypothermia, which enables them to lower their body temperature about 12 to 15 degrees Fahrenheit. This allows them to conserve their fat storage and survive some of the coldest nights. Another great way to stay warm is to share a roost cavity and body heat with a fellow chickadee!
They flock together and hang out in the same place forming a social group of 6-10 birds during the daytime in the winter. One could see these social groups that chickadees form around feeders; sometimes nuthatches and downy woodpeckers will join these social groups which are called flocks. These flocks defend a territory of up to 20 acres and you can usually hear territory skirmishes surrounding the feeders. Listen for a “dee-dee” alarm sound when chickadees are defending their territory. There are many different communication sounds going on at your feeders, so get out there and listen!
Author: Sydney Weisinger – Teacher/Naturalist
Black-capped chickadees may be one of the most easily recognizable birds both by their look and by their call: “chicka-dee-dee-dee”. However, did you know that chickadees are one of the smallest and hardiest birds that stays and faces Minnesota winters head on? Most people think about birds migrating south, moving to warmer locations, and living through the winter season in these areas. Have you ever considered how such a tiny bird like the chickadee manages to survive our harsh Minnesota winters?
One of my favorite classes to teach was about birds in the winter. Specifically chickadees because they have some great adaptations to survive the cold winter months. One of the chickadees adaptations is their memory. To demonstrate this to the students, we would take a handful of sunflower seeds and hide them outside before going on a birding hike, then we would have to come back 2 hours later and try to find all the seeds we hid. This activity opened the student’s eyes to how amazing chickadees memories are, because most of the students could not remember where they hid their seeds. Chickadees start to stash food in autumn to go back to on really cold and short days. Having extra stashes of food around is necessary for these birds since they are burning so much energy every day in order to keep their body temperature around 108 degrees Fahrenheit. Of course, their half-inch coat of insulating feathers helps keep them warm. They fluff those feathers up at night to fill every inch of their roost cavities to keep out as much wind as possible. The most amazing adaptation is the fact that they have the ability to go into regulated hypothermia, which enables them to lower their body temperature about 12 to 15 degrees Fahrenheit. This allows them to conserve their fat storage and survive some of the coldest nights. Another great way to stay warm is to share a roost cavity and body heat with a fellow chickadee!
They flock together and hang out in the same place forming a social group of 6-10 birds during the daytime in the winter. One could see these social groups that chickadees form around feeders; sometimes nuthatches and downy woodpeckers will join these social groups which are called flocks. These flocks defend a territory of up to 20 acres and you can usually hear territory skirmishes surrounding the feeders. Listen for a “dee-dee” alarm sound when chickadees are defending their territory. There are many different communication sounds going on at your feeders, so get out there and listen!
Author: Sydney Weisinger – Teacher/Naturalist
February - Frogs
Pictured: Nature Center's resident gray tree frog
Frogs in February?
Wintertime is the time that we think about hibernation, and usually we think of things like bears, chipmunks, bats, even groundhogs! But, what about some of our more cold-blooded animal friends? Different animals have different ways to help them get through the winter. Take frogs for example. In the midst of February it is extremely unlikely that you will come across a frog active anytime this month but they do not disappear, they are hunkered down for the cold. Some aquatic frogs like leopard frogs hang out under water all winter (below the ice, but not buried in mud) where they will slowly swim around. If we take a trek from the water onto land, we find other types of amphibians hibernating. The American toad has specially designed backed legs to dig and burrow down into the soil to wait out the cold winter months under the frost line. Some other smaller frogs that you can usually find on land here in Minnesota are ones like wood frogs, chorus frogs, spring peepers, and gray tree frogs. They do not have the adaptations to help burrow under soils so they have to settle for burying themselves underneath leaf litter as well as in cracks in the ground and in felled trees or logs. As you can imagine, the frost and frozen temperatures are not stopped by a mere 2 inches of leaves, nor does an old dead log provide protection from the freezing temperatures we are all accustomed to in the wintertime. How are the small, cold-blooded frogs supposed to survive the cold all winter long?
Believe it or not, the answer is antifreeze! The small terrestrial frogs that cannot escape the cold by burrowing under the frost line rely on a high concentration of glucose in vital organs to make sure that they do not freeze solid. The non-vital organs along with the rest of the body cavity will freeze completely through, ice crystals and all! The partially frozen frogs will not only stop breathing, but their heart will stop beating until the frog thaws back out. When a living creature stops breathing, its heart stops beating, and is frozen solid you would think it would be dead! Not these frogs! They just wait for the spring thaw when their heart and lungs defrost and can function again as if nothing ever happened.
Spring is about rebirth and for frogs, it sometimes means coming back from the dead! If you happen to come across a frog outside in your winter activities remember to leave it be. It is highly adapted for our Minnesota winters!
Author: Kelly Bahl - Teacher/Naturalist Intern
March - Great Horned Owlets
Pictured: Baby Great Horned Owlets
Owlets in March?
You may be familiar with the famous call “whoo, whoo-hoo, whoo, whoo” belonging to the majestic Great Horned Owl. However, did you know that these owls are the earliest birds in the state to hatch their young? March is prime time for Great Horned Owls to hatch, although nesting can occur as early as December and January. In the dead of winter, Great Horned Owls will start their courtship ritual and begin to establish a territory. These birds are generally very aggressive and will often take over the nest of other birds instead of building their own. In late January and February, they will lay their eggs and incubate them for a period of 28-35 days. Females usually lay a small clutch of 2-3 eggs. Incubating eggs during February and March is a challenge due to fluctuating temperatures. Eggs must always be kept warm and if the eggs become too cold, they will not hatch.
So why do Great Horned Owls nest so early, if it carries a risk? As the largest North American owl species, the young develop slower than other birds. By nesting in the winter, Great Horned Owls ensure that their young will be ready to leave the nest at the peak of Spring. Hatching early allows more time to develop not only in size, but also for the young owlets to become master hunters. These owls have been nicknamed “Tigers of the sky”, due to their aggressive nature and ability to capture a wide variety of prey. They have an appetite for a wide range of small game like rabbits, squirrels, skunks, and other birds. On numerous occasions they have been known to grab prey 3 to 4 times their own body weight! To aid in the hunt, Great Horned Owls have an incredible sense of hearing. They can hear a small animal rustling in leaves at around 900 ft below them and even under a foot of snow! Contrary to popular belief, the tufts on the top of their head are not ears. These tufts are called plumicorns and their function is to help the owl camouflage in trees as well as express behavior. The real ears of the owl are located underneath feathers on the side of their head. In addition to incredible hearing, Great Horned Owls also have excellent eyesight that is triggered by movement. A Great Horned Owl is capable of spotting a mouse about a football field away, in both light and dark conditions. Its eyes are so large that they occupy 50% of the skull. If humans had the same eye to skull ratio as an owl, our eyes would be about the size of a grapefruit! The earlier Great Horned Owls hatch, the more practice time they get to hone their senses and become proficient hunters.
Next time you are out on a walk near the woods, look up into the trees and see if you can spot the fluffy silhouette of a Great Horned Owlet. They may look cute and fluffy now, but they will soon grow up to become true Tigers of the Sky.
Author: Alison Jennings - Teacher/Naturalist Intern
You may be familiar with the famous call “whoo, whoo-hoo, whoo, whoo” belonging to the majestic Great Horned Owl. However, did you know that these owls are the earliest birds in the state to hatch their young? March is prime time for Great Horned Owls to hatch, although nesting can occur as early as December and January. In the dead of winter, Great Horned Owls will start their courtship ritual and begin to establish a territory. These birds are generally very aggressive and will often take over the nest of other birds instead of building their own. In late January and February, they will lay their eggs and incubate them for a period of 28-35 days. Females usually lay a small clutch of 2-3 eggs. Incubating eggs during February and March is a challenge due to fluctuating temperatures. Eggs must always be kept warm and if the eggs become too cold, they will not hatch.
So why do Great Horned Owls nest so early, if it carries a risk? As the largest North American owl species, the young develop slower than other birds. By nesting in the winter, Great Horned Owls ensure that their young will be ready to leave the nest at the peak of Spring. Hatching early allows more time to develop not only in size, but also for the young owlets to become master hunters. These owls have been nicknamed “Tigers of the sky”, due to their aggressive nature and ability to capture a wide variety of prey. They have an appetite for a wide range of small game like rabbits, squirrels, skunks, and other birds. On numerous occasions they have been known to grab prey 3 to 4 times their own body weight! To aid in the hunt, Great Horned Owls have an incredible sense of hearing. They can hear a small animal rustling in leaves at around 900 ft below them and even under a foot of snow! Contrary to popular belief, the tufts on the top of their head are not ears. These tufts are called plumicorns and their function is to help the owl camouflage in trees as well as express behavior. The real ears of the owl are located underneath feathers on the side of their head. In addition to incredible hearing, Great Horned Owls also have excellent eyesight that is triggered by movement. A Great Horned Owl is capable of spotting a mouse about a football field away, in both light and dark conditions. Its eyes are so large that they occupy 50% of the skull. If humans had the same eye to skull ratio as an owl, our eyes would be about the size of a grapefruit! The earlier Great Horned Owls hatch, the more practice time they get to hone their senses and become proficient hunters.
Next time you are out on a walk near the woods, look up into the trees and see if you can spot the fluffy silhouette of a Great Horned Owlet. They may look cute and fluffy now, but they will soon grow up to become true Tigers of the Sky.
Author: Alison Jennings - Teacher/Naturalist Intern
April - spring critters
Julie holding a juvenile Barred Owl that fell out of its nest.
Orphaned Baby Animals
With spring comes baby critters. An orphan is defined when the critter’s parents are no longer present to feed and protect it. Before rescuing an animal make sure, it really needs help. Please remember that a young animal’s best chance for survival is to be raised by its natural mother. It is very important to make sure that every effort is made to try to return the young to its mother. If you have witnessed the death of its mother, it is obviously an orphan. However, a dead squirrel or rabbit in the street does not necessarily mean the squirrel or rabbit nest in your yard belongs to the dead critter. Many species have hiding techniques to protect their young. A good example are cottontail rabbits. They only visit their nest at dawn and dusk to feed their offspring so you usually do not see the parent during the day. They stay away from the nest during the day because they do not want to attract the attention of predators. If you find a nest of baby rabbits and believe the mother is missing lay sticks in a specific pattern around the nest or spread flour. Come back the next day and see if the flour or sticks have been disturbed. If the sticks have been moved or you see tracks in the flour and the infants appear to be fine, the mother has made a visit to the nest and the animals are not really orphans. The mother will accept humans have touched her offspring even after returning the critter to the nest. It is a myth that a wild animal mother of any species will reject her baby if a human touched it. Please do not remove the babies from the nest for an extended period of time. Just think how the mother would feel if her baby were gone for overnight. She may think a predator has taken her young and abandon the nest site. Returning an orphan to their nest or making a temporary nest as soon as possible is the best answer for baby critters. If you find a baby bird on the ground and are not sure what tree or where the nest is, get a small to medium wicker or weaved basket that allows water to flow through and put nesting materials (finely shredded paper or crushed leaves) in with the baby bird and hang it securely up in a tree. The baby bird’s vocal cries will bring the mother back. Just because the baby bird is out of the nest does not mean it is an orphan. Even if the baby critters are on the ground or out of the nest, the parents will continue to feed and protect them. Older juvenile birds are “fledglings or branchers” and are trying out their new flight wings. They cannot completely fly yet and end up being cared for on the ground by their parents. The concern is that predators such as cats, dogs, fox and raccoons will prey upon exposed youngsters. Getting them back up on to a tree limb helps these critters survive. Fawns are often left alone by their mother for periods of time. The mother does not want to attract predators to their young. Rest assured they are close to them. Please leave the fawns where you found them. The mother will soon return unless you have witnessed her death.
An important note is that it is illegal to keep wild animals without a wildlife rehabilitation license. Only a person with proper skills, facilities, equipment and knowledge can raise a healthy baby critter and release it with a good chance of survival. Taking care of wild animals means devoting a great deal of time and energy in meeting their needs. For example, mother songbirds feed their young about 4 to 12 times an hour 24 hours a day during their first days of life.
The staff at the Jay C. Hormel Nature Center take in ONLY birds of prey, like a hawk, owl or an eagle. The JCHNC staff provides primary/triage care and will make the best decision regarding treatment and transport the injured raptor to the University of Minnesota Raptor Center. We do not have the facilities, extra staff or expertise to provide care for mammals, waterfowl, reptiles or songbirds.
If you find an injured mammal, reptile, waterfowl or songbird other than a raptor the closest free rehabilitation center is in Roseville, Minnesota. You can transport the injured animal to 2530 Dale Street North, Roseville. The phone number is 651-486-9453. The Roseville Wildife Rehabilitation Center is an emergency hospital and clinic that provides free medical care for over 200 different species of injured or orphaned wild animals. The Nature Center does not transport animals to this facility.
Wild critters are meant to be in the wild. If animals grow up unafraid of humans they will have no chance to survive in the wild once released. Sometimes it is necessary to intervene and help the animal that is orphaned or injured. Working together we can offer many young critters a second chance at life in the wild. Please remember if you find an injured hawk, owl or eagle in Mower County call the Nature Center at 507-437-7519 and we will do our best to rescue the raptor, assess its status and transport the raptor to the University of Minnesota Raptor Center for treatment.
Author: Julie Champlin - Office Manager
With spring comes baby critters. An orphan is defined when the critter’s parents are no longer present to feed and protect it. Before rescuing an animal make sure, it really needs help. Please remember that a young animal’s best chance for survival is to be raised by its natural mother. It is very important to make sure that every effort is made to try to return the young to its mother. If you have witnessed the death of its mother, it is obviously an orphan. However, a dead squirrel or rabbit in the street does not necessarily mean the squirrel or rabbit nest in your yard belongs to the dead critter. Many species have hiding techniques to protect their young. A good example are cottontail rabbits. They only visit their nest at dawn and dusk to feed their offspring so you usually do not see the parent during the day. They stay away from the nest during the day because they do not want to attract the attention of predators. If you find a nest of baby rabbits and believe the mother is missing lay sticks in a specific pattern around the nest or spread flour. Come back the next day and see if the flour or sticks have been disturbed. If the sticks have been moved or you see tracks in the flour and the infants appear to be fine, the mother has made a visit to the nest and the animals are not really orphans. The mother will accept humans have touched her offspring even after returning the critter to the nest. It is a myth that a wild animal mother of any species will reject her baby if a human touched it. Please do not remove the babies from the nest for an extended period of time. Just think how the mother would feel if her baby were gone for overnight. She may think a predator has taken her young and abandon the nest site. Returning an orphan to their nest or making a temporary nest as soon as possible is the best answer for baby critters. If you find a baby bird on the ground and are not sure what tree or where the nest is, get a small to medium wicker or weaved basket that allows water to flow through and put nesting materials (finely shredded paper or crushed leaves) in with the baby bird and hang it securely up in a tree. The baby bird’s vocal cries will bring the mother back. Just because the baby bird is out of the nest does not mean it is an orphan. Even if the baby critters are on the ground or out of the nest, the parents will continue to feed and protect them. Older juvenile birds are “fledglings or branchers” and are trying out their new flight wings. They cannot completely fly yet and end up being cared for on the ground by their parents. The concern is that predators such as cats, dogs, fox and raccoons will prey upon exposed youngsters. Getting them back up on to a tree limb helps these critters survive. Fawns are often left alone by their mother for periods of time. The mother does not want to attract predators to their young. Rest assured they are close to them. Please leave the fawns where you found them. The mother will soon return unless you have witnessed her death.
An important note is that it is illegal to keep wild animals without a wildlife rehabilitation license. Only a person with proper skills, facilities, equipment and knowledge can raise a healthy baby critter and release it with a good chance of survival. Taking care of wild animals means devoting a great deal of time and energy in meeting their needs. For example, mother songbirds feed their young about 4 to 12 times an hour 24 hours a day during their first days of life.
The staff at the Jay C. Hormel Nature Center take in ONLY birds of prey, like a hawk, owl or an eagle. The JCHNC staff provides primary/triage care and will make the best decision regarding treatment and transport the injured raptor to the University of Minnesota Raptor Center. We do not have the facilities, extra staff or expertise to provide care for mammals, waterfowl, reptiles or songbirds.
If you find an injured mammal, reptile, waterfowl or songbird other than a raptor the closest free rehabilitation center is in Roseville, Minnesota. You can transport the injured animal to 2530 Dale Street North, Roseville. The phone number is 651-486-9453. The Roseville Wildife Rehabilitation Center is an emergency hospital and clinic that provides free medical care for over 200 different species of injured or orphaned wild animals. The Nature Center does not transport animals to this facility.
Wild critters are meant to be in the wild. If animals grow up unafraid of humans they will have no chance to survive in the wild once released. Sometimes it is necessary to intervene and help the animal that is orphaned or injured. Working together we can offer many young critters a second chance at life in the wild. Please remember if you find an injured hawk, owl or eagle in Mower County call the Nature Center at 507-437-7519 and we will do our best to rescue the raptor, assess its status and transport the raptor to the University of Minnesota Raptor Center for treatment.
Author: Julie Champlin - Office Manager
May - trout habitat
With the addition of rainbow trout to Mower County’s Wolf Creek it will give local anglers a place closer to home to fish for trout. This is exciting and long awaited news for many, but how did Wolf Creek get picked and why is it good location for trout?
Here at the Nature Center we teach Austin 7th graders all about water/ stream ecology. Something that we stress in our curriculum is how everything is connected, not only in the water itself but also actions that take place on land. All the land around a stream that drains into a stream is called the stream’s watershed. The water and everything that depends on it, is affected by what happens on the land in the watershed. That’s why when looking for good trout habitat we first have to look to the land in the watershed. Talking with James Fett, Watershed Technician at Mower County Soil and Water Conservation District he stated “that projects like Conservation Reserve Program (CRP), MNCREP and Reinvest in Minnesota (RIM) have permanently restored acres of wetland and prairies around Wolf Creek to help reduce sediment and nutrient concentrations.” What we like to emphasize to the 7th graders about projects like these is that if these projects did not exists sediment flowing into the stream from floods or heavy rainfall would cover the rocky bottom of the stream bed, destroying habitat for small aquatic animals that larger animals depend on. Covering the rocky bottom also decreases ripples in the water, which decreases the amount of dissolved oxygen for fish to use. Sediment also makes the water cloudy which if the water continues to stay murky and cloudy the temperature of the stream will increase.
During our 7th grade class we test Dobbins Creek for common nutrients like phosphorus and nitrogen and the pH levels. If there are too high concentrations of these nutrients, plant matter grows very fast and it will eventually outgrow the demand of the food chain. With an increase of plant matter growth, usually algae, comes higher pH levels which can be deadly to most aquatic life. As the plant matter starts to die and is decomposed by microorganisms, dissolved oxygen is consumed as well, leaving less oxygen in the water for aquatic life. Trout need a significant amount of dissolved oxygen to survive. When we talk about dissolved oxygen we also talk about water temperature because trout need fairly cold water temperatures of about 50-60 degrees Fahrenheit. According to James Fett, “Wolf Creek is colder than many others in our area thanks to groundwater and spring outflow in Todd Park.” Colder water temperatures also hold onto more dissolved oxygen, which in turn is able to support a larger population of trout.
In order for trout stocking and fishing to continue, good trout habitat has to continue to be maintained. That is why programs like these are so important and have a great impact on the environment around us. Now more people are becoming connected to the land, their local watershed, and their waterways, thanks to the work that has been done to stock trout in Wolf Creek.
Author: Teacher/Naturalist Sydney Weisigner
Here at the Nature Center we teach Austin 7th graders all about water/ stream ecology. Something that we stress in our curriculum is how everything is connected, not only in the water itself but also actions that take place on land. All the land around a stream that drains into a stream is called the stream’s watershed. The water and everything that depends on it, is affected by what happens on the land in the watershed. That’s why when looking for good trout habitat we first have to look to the land in the watershed. Talking with James Fett, Watershed Technician at Mower County Soil and Water Conservation District he stated “that projects like Conservation Reserve Program (CRP), MNCREP and Reinvest in Minnesota (RIM) have permanently restored acres of wetland and prairies around Wolf Creek to help reduce sediment and nutrient concentrations.” What we like to emphasize to the 7th graders about projects like these is that if these projects did not exists sediment flowing into the stream from floods or heavy rainfall would cover the rocky bottom of the stream bed, destroying habitat for small aquatic animals that larger animals depend on. Covering the rocky bottom also decreases ripples in the water, which decreases the amount of dissolved oxygen for fish to use. Sediment also makes the water cloudy which if the water continues to stay murky and cloudy the temperature of the stream will increase.
During our 7th grade class we test Dobbins Creek for common nutrients like phosphorus and nitrogen and the pH levels. If there are too high concentrations of these nutrients, plant matter grows very fast and it will eventually outgrow the demand of the food chain. With an increase of plant matter growth, usually algae, comes higher pH levels which can be deadly to most aquatic life. As the plant matter starts to die and is decomposed by microorganisms, dissolved oxygen is consumed as well, leaving less oxygen in the water for aquatic life. Trout need a significant amount of dissolved oxygen to survive. When we talk about dissolved oxygen we also talk about water temperature because trout need fairly cold water temperatures of about 50-60 degrees Fahrenheit. According to James Fett, “Wolf Creek is colder than many others in our area thanks to groundwater and spring outflow in Todd Park.” Colder water temperatures also hold onto more dissolved oxygen, which in turn is able to support a larger population of trout.
In order for trout stocking and fishing to continue, good trout habitat has to continue to be maintained. That is why programs like these are so important and have a great impact on the environment around us. Now more people are becoming connected to the land, their local watershed, and their waterways, thanks to the work that has been done to stock trout in Wolf Creek.
Author: Teacher/Naturalist Sydney Weisigner
June - CURIOUS CRUSTACEANS
Crayfish caught at the Nature Center in Dobbins Creek.
Crayfish, Crawfish, crawdad, mud bug. A variety of different names to describe a very abundant crustacean. Crayfish are cousins to lobsters and can be found on five continents. There are well over 200 species of crayfish in North America alone. It can survive in diverse fresh or salt water habitats. Here in Minnesota you can find them in rivers, ponds, lakes, streams, you name it, as long as there is clean enough water and abundant food for them the crayfish will thrive.
Crayfish are one of the most well-known freshwater crustacean and a frequent resident of Dobbins Creek out at the Hormel Nature Center. They have a lot of unique adaptations to make living in so many aquatic ecosystems around the world possible. Four pairs of walking legs make locomotion on land or in the water relatively easy. However, if the crayfish under water needs a faster mode of transportation it will swim. Crayfish move forward slow and steadily when walking, but when swimming it’s a quick propulsion backwards with a flick of their abdomen (tail part).
Large claws are used to defend themselves or crush and tear food into manageable pieces to eat. Small arm like appendages will then funnel food into its mouth. A crayfish’s food could be anything! They are omnivores so will eat whatever that they can get their hands on consuming aquatic plants, decaying leaves, shrimp, small fish or insects, and even other crayfish!
These small crustaceans are extremely territorial and will defend their dominions underwater with gusto so can be found constantly fighting. When having to rage through many battles in their lifetime, it is no surprise that there are losses that go along with it. The loser of a battle may be eaten, but other times they may just lose a limb or one of their claws. If an injury to a leg or claw gets torn off it is not the end of the world because crayfish have the ability to regrow a lost limb! If you have ever come across a crayfish with one claw, or one big and one really small the small one is just going through the process of regeneration.
Not only is regeneration of lost limbs super cool to see on crayfish, it could potentially have an impact for us humans! There are some biologists that have been studying mechanisms for neural regeneration and repair in crayfish (a fancy way of saying why crayfish can regrow a lost limb). But, not only can crayfish regenerate a leg, or one of its claws, but this organism is constantly regenerating neurons to help with their senses/brain activity. This has scientists fascinated and they have been studying the subject in depth to gain a better understanding of how it works so it can be used for human medical research! Who knows, maybe someday far in the future people will be able to regrow a lost hand thanks to understanding how a crayfish does it. A crazy thought to think about the next time you encounter these Minnesota native crustaceans.
By: Kelly Bahl Teacher/Naturalist Intern
Crayfish are one of the most well-known freshwater crustacean and a frequent resident of Dobbins Creek out at the Hormel Nature Center. They have a lot of unique adaptations to make living in so many aquatic ecosystems around the world possible. Four pairs of walking legs make locomotion on land or in the water relatively easy. However, if the crayfish under water needs a faster mode of transportation it will swim. Crayfish move forward slow and steadily when walking, but when swimming it’s a quick propulsion backwards with a flick of their abdomen (tail part).
Large claws are used to defend themselves or crush and tear food into manageable pieces to eat. Small arm like appendages will then funnel food into its mouth. A crayfish’s food could be anything! They are omnivores so will eat whatever that they can get their hands on consuming aquatic plants, decaying leaves, shrimp, small fish or insects, and even other crayfish!
These small crustaceans are extremely territorial and will defend their dominions underwater with gusto so can be found constantly fighting. When having to rage through many battles in their lifetime, it is no surprise that there are losses that go along with it. The loser of a battle may be eaten, but other times they may just lose a limb or one of their claws. If an injury to a leg or claw gets torn off it is not the end of the world because crayfish have the ability to regrow a lost limb! If you have ever come across a crayfish with one claw, or one big and one really small the small one is just going through the process of regeneration.
Not only is regeneration of lost limbs super cool to see on crayfish, it could potentially have an impact for us humans! There are some biologists that have been studying mechanisms for neural regeneration and repair in crayfish (a fancy way of saying why crayfish can regrow a lost limb). But, not only can crayfish regenerate a leg, or one of its claws, but this organism is constantly regenerating neurons to help with their senses/brain activity. This has scientists fascinated and they have been studying the subject in depth to gain a better understanding of how it works so it can be used for human medical research! Who knows, maybe someday far in the future people will be able to regrow a lost hand thanks to understanding how a crayfish does it. A crazy thought to think about the next time you encounter these Minnesota native crustaceans.
By: Kelly Bahl Teacher/Naturalist Intern
JULY - ACROBATS OF THE SKY
Dragonflies and damselflies are the true acrobats of the sky. They can fly side to side, upside down and turn 360 degrees in a split second. They can also fly vertically like a helicopter shooting straight up in the air, hover motionless and fly backwards with as much skill as they can fly forward. Dragonflies are the only insects that fly backwards. They are truly amazing. If you do see dragonflies and damselflies buzz by your garden, lake home, boat dock, rivers or playgrounds it is definitely something to celebrate. These insects spend most of their life as nymphs in the water, so they only thrive in places, where pond, lake or river quality is good.
According to the Minnesota Department of Natural Resources, dragonflies and their close relatives called damselflies are ancient insects and prehistoric reminders of the age of the dinosaurs. Enormous dragonflies with a wingspread up to 30 inches across and 18 inches in length existed about 250-325 million years ago as compared to present day 4-7 inch wingspread and in 1-4 inches in length. It is believed that prehistoric insects were much larger than modern day insects because of the high concentration of oxygen in the atmosphere, about 35 percent. That percentage has decreased since the days of the dinosaurs and is now about 21 percent.
Even with major changes in the landscape over millions of years, dragonflies have continued to adapt and are found on every continent except Antarctica. There are an estimated 5,500 to 6,500 dragonfly and damselfly species in the world. In Minnesota, there are about 151 total species with 53 species in Mower County according to Odonata Central.
A few years ago, Kurt Mead, the head Interpretive Naturalist at Minnesota’s Tettegouche State Park along the North Shore of Lake Superior presented a program for staff and the public at the Jay C. Hormel Nature Center on dragonflies and damselflies. He is also the founder and former coordinator for the Minnesota Odonata Survey Project and helped form the non-profit Minnesota Dragonfly Society. He is the author of the comprehensive field guide “Dragonflies of the North Woods”. Kurt’s presentation was enlightening and informative and a perfect pairing with our aquatic curriculum. Scooping the pond for aquatic critters is a favorite field trip activity at the Nature Center for all ages. We get excited when patrons scoop the pond and find dragonfly or damselfly nymphs and like to share information about their life cycle.
Dragonflies have special adaptations to survive as a nymph and as an adult in capturing their food. As a nymph, the dragonfly larvae hunts voraciously with a special tool called a “mask” or a hinged labium. It looks like a lower mandible that is folded and held on the lower face of the nymph. It extends forward in 25 milliseconds to capture mosquito larvae, tadpoles, small fish, snails and worms. They will even eat each other. They breathe through gills in their rectum and can rapidly propel themselves forward by suddenly expelling water through the anus. Eastern Pond Hawk nymphs can shoot their fecal material out 23 feet when propelling themselves forward. They are “jet” propelled. The larvae stage can last between two months and 5 years or more depending on the species. When it is time to metaphase into an adult, the nymph stops eating and climbs up a reed or a plant. The skin begins to split behind the head and back and the adult dragonfly emerges. They pump haemolymph blood into their wings to harden and expand them to prepare for flight. Besides being excellent fliers, adult dragonflies have 30,000 lenses to help locate their food. They capture their prey in flight and eat a large variety of insects ranging from small midges, mosquitos, flies, butterflies, moths, damselflies and smaller dragonflies.
I am not a fan of mosquitos, so I like the fact that dragonflies feed on mosquito larvae as a nymph and will eat 30 to hundreds of mosquitos daily as an adult. They are often called “mosquito hawks”. Take some time to observe dragonflies and damselflies the next time you are at the Nature Center. You can identify a dragonfly as they perch with their wings apart and a damselfly perches with their wings together. I have a favorite Advice from a Dragonfly tee shirt that states we all should spend time near the water, be colorful, enjoy a good reed, zoom in on your dreams, appreciate long summer days, and just wing it! Sound advice from ancient insects!
Author: Julie Champlin
According to the Minnesota Department of Natural Resources, dragonflies and their close relatives called damselflies are ancient insects and prehistoric reminders of the age of the dinosaurs. Enormous dragonflies with a wingspread up to 30 inches across and 18 inches in length existed about 250-325 million years ago as compared to present day 4-7 inch wingspread and in 1-4 inches in length. It is believed that prehistoric insects were much larger than modern day insects because of the high concentration of oxygen in the atmosphere, about 35 percent. That percentage has decreased since the days of the dinosaurs and is now about 21 percent.
Even with major changes in the landscape over millions of years, dragonflies have continued to adapt and are found on every continent except Antarctica. There are an estimated 5,500 to 6,500 dragonfly and damselfly species in the world. In Minnesota, there are about 151 total species with 53 species in Mower County according to Odonata Central.
A few years ago, Kurt Mead, the head Interpretive Naturalist at Minnesota’s Tettegouche State Park along the North Shore of Lake Superior presented a program for staff and the public at the Jay C. Hormel Nature Center on dragonflies and damselflies. He is also the founder and former coordinator for the Minnesota Odonata Survey Project and helped form the non-profit Minnesota Dragonfly Society. He is the author of the comprehensive field guide “Dragonflies of the North Woods”. Kurt’s presentation was enlightening and informative and a perfect pairing with our aquatic curriculum. Scooping the pond for aquatic critters is a favorite field trip activity at the Nature Center for all ages. We get excited when patrons scoop the pond and find dragonfly or damselfly nymphs and like to share information about their life cycle.
Dragonflies have special adaptations to survive as a nymph and as an adult in capturing their food. As a nymph, the dragonfly larvae hunts voraciously with a special tool called a “mask” or a hinged labium. It looks like a lower mandible that is folded and held on the lower face of the nymph. It extends forward in 25 milliseconds to capture mosquito larvae, tadpoles, small fish, snails and worms. They will even eat each other. They breathe through gills in their rectum and can rapidly propel themselves forward by suddenly expelling water through the anus. Eastern Pond Hawk nymphs can shoot their fecal material out 23 feet when propelling themselves forward. They are “jet” propelled. The larvae stage can last between two months and 5 years or more depending on the species. When it is time to metaphase into an adult, the nymph stops eating and climbs up a reed or a plant. The skin begins to split behind the head and back and the adult dragonfly emerges. They pump haemolymph blood into their wings to harden and expand them to prepare for flight. Besides being excellent fliers, adult dragonflies have 30,000 lenses to help locate their food. They capture their prey in flight and eat a large variety of insects ranging from small midges, mosquitos, flies, butterflies, moths, damselflies and smaller dragonflies.
I am not a fan of mosquitos, so I like the fact that dragonflies feed on mosquito larvae as a nymph and will eat 30 to hundreds of mosquitos daily as an adult. They are often called “mosquito hawks”. Take some time to observe dragonflies and damselflies the next time you are at the Nature Center. You can identify a dragonfly as they perch with their wings apart and a damselfly perches with their wings together. I have a favorite Advice from a Dragonfly tee shirt that states we all should spend time near the water, be colorful, enjoy a good reed, zoom in on your dreams, appreciate long summer days, and just wing it! Sound advice from ancient insects!
Author: Julie Champlin