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Mammals are warm-blooded vertebrates. Most mammals have fur, start life inside their moms, are born live, and nurse milk from their mothers' bodies.

A Mammal
13-lined Ground Squirrel
Sometimes called "Federation Squirrels" because the pattern on their back looks like stars and stripes.
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Brown Bat
Bats belong to a special group of flying mammals called Chiroptera.
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Little bat on a hand
Here's the scoop on Wisconsin's bats.
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Lynx
You'll probably never see a lynx in the wild. They are uncommon in Wisconsin and pretty secretive.
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Chipmunk
Sometimes called "chipppie" or "chipping squirrel."
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Cottontail Rabbit
If you like to play freeze tag, you might want to take a few lessons from the cottontail rabbit.
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Coyote
The coyote is a smart and highly adaptable animal.
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Badger
If you live in Wisconsin, you may already be a badger—a badger football fan that is.
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Elk
Elk are members of the deer family along with moose, caribou, mule deer, and white-tailed deer.
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Bobcat
Do you know what makes a mammal a mammal?
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Meadow Vole
Voles are easy to find by their "runways" that are lined with grass and other material from where they were digging.
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Moose
How do you get a 900 pound moose to stand still and let you put a radio-collar on her?
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Muskrat in grass
The name comes from the musky odor that this small mammal gives off.
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Oposum walking
Have you ever heard of "playing 'possum"?
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Pine Marten in tree
The pine marten is nocturnal and we don't know much about them.
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Raccoon in tree
The raccoon is a common backyard "bandit" that is easy to spot.
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Snowshoe Hare
This hare changes its coat twice a year, exchanging a thin brown summer coat for a heavy, white winter coat.
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Skunk in grass
The skunk is a member of the weasel family.
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Beaver
The beaver holds the title for being the largest rodent in North America.
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Black Bear
It is rare that you will come in contact with a bear unless you are near bear country.
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Bobcat
What has a stubby "bobbed" tail, sideburns, spiky ear hair and gets called lots of names?
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The Flying Squirrel
It's small, furry, and "flies" from tree to tree.
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Gray Squirrel
Have you ever watched a gray squirrel get to a "squirrel-proof" bird feeder?
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Mink
Sleek with thick, chocolate brown fur, minks are related to the badger and skunk.
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Porcupine on a log eating berries
This mammal is not the sharp-shooter that many people think.
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Red fox in snow
Foxes no doubt got their crafty reputation from the way they look.
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Otter in water
Wild otters are not often seen because they are very secretive.
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Wolf pack
Have you ever heard a wolf howl in the wild? Not many people have.
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White-Tailed Deer
The white-tailed deer is one of North America's most abundant big-game animal.
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Gray wolf in snow
Take a look at these Wisconsin wolf photos taken from the air!
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At a Glance

  • 13-lined Ground Squirrel

    Sometimes called "Federation Squirrels" because the pattern on their back looks like stars and stripes.

  • Brown Bat

    Bats belong to a special group of flying mammals called Chiroptera.

  • Little bat on a hand

    Here's the scoop on Wisconsin's bats.

  • Lynx

    You'll probably never see a lynx in the wild. They are uncommon in Wisconsin and pretty secretive.

  • Chipmunk

    Sometimes called "chipppie" or "chipping squirrel."