Mammals
Scientifically-speaking there are 11 mammal groups, and most Mammals are warm-blooded, have body hair, give live birth and nurse their young with milk from mammary glands. Check out these articles about all kinds of mammals.
River Otter vs. Sea Otter Size, Fur Density and Food Preferences
This Is the Biggest Whale, by Length and by Weight
The Bowhead Whale Survives Icy Waters and Killer Whale Attacks
The Largest Bat in the World Has a Wingspan Over 5 Feet
Baby Bats Babble With Moms, Hinting at Human Language Development
Fruit Bats Are the Best Pollinators (and Suppliers of Tequila)
What Do Pandas Eat (Other Than Bamboo)?
Polar Bear vs. Grizzly Bear: Which Bear Is Bigger and Tougher?
The Biggest Bear Stands 5 Feet Tall on All Fours (Not Even on Its Hind Legs)
10 Types of Lions (Including 4 Extinct Species)
What Do Lions Eat in the Wild?
Black-footed Cat: A Tiny and Ferocious Predator
Bison Bounced Back From Near Extinction
Ox vs. Bull: Born to Breed or Born to Work?
Ox vs. Cow: Different Uses for the Same Species
The Happiest Animal on Earth Is the Quokka
What Do Possums Eat? Most Things, It Turns Out
What's It Like Inside a Kangaroo's Pouch?
15 Types of Monkeys Climbing Trees All Around the World
What Do Gorillas Eat? How Are They Such Muscular Herbivores?
The Tarsier Is One Weird Primate, and Yes, We're Related
What Do Groundhogs Eat?
What Do Squirrels Eat (Aside From Nuts)?
What Do Rats Eat? Whatever They Can Get Their Paws On
What Do Skunks Eat? Just About Anything They Find
What Do Raccoons Eat? You Won't Be Surprised
What Do Foxes Eat When They're Not Raiding Your Garden?
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This kitten-looking wild cat is known as the 'hummingbird of the cat family' and could almost fit in the palm of your hand, but its diminutive size belies a ferocious personality.
By Wendy Bowman
Aardwolves aren't closely related to either aardvarks or wolves, but these little hyenas resemble both in some ways.
The stoat and the weasel might look alike, but they're not the same animal. The stoat is a serious predator that kills its prey like a vampire!
By Zach Taras
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Lemmings don't commit mass suicide as is popularly believed, but they are aggressive and have even been known to charge larger predators.
Technically they're called tanuki, but these furry critters might as well be called raccoon dogs because that's what they look like. So are they just as domesticated and loving as the canines we know?
Spider monkeys, an endangered species, are the largest monkeys in the Americas and live in the forest canopy, where they swing through the trees with the greatest of ease.
It's an age-old question. How much wood would a woodchuck chuck? Turns out, none at all. So what would a woodchuck chuck if it couldn't chuck wood?
By Katie Carman
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The okapi may look like a zebra-horse combo, but its closest relative is the giraffe. Here are nine fascinating facts about this curious creature.
By Wendy Bowman
The anteater has one of the strangest-looking noses in the animal kingdom, a truly fabulous hairdo and a tongue that reaches places never meant to see the light of day.
By Wendy Bowman
While yaks share the bovine family tree with cows, they're a different species altogether. And, unlike cow dung, yak poop doesn't stink.
By Katie Carman
Wondering what's going on in the animal world while you're all cooped up under quarantine? Check out these webcams and get a virtual glimpse into how the animals live.
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Known in some circles as a 'musk hog' or 'skunk pig,' the javelina's good looks may be in the eye of the beholder, but there's a lot more to this beauty than meets the eye.
By Wendy Bowman
The arctic fox is able to thrive in temperatures as low as -58 degrees F (-50 degrees C), largely because it has fur on the soles of its feet and the warmest coat of any animal on Earth.
By Wendy Bowman
Puma, panther, mountain cat, mountain lion, mountain screamer, painter, catamount and, yes, cougar. This cat has a lot of names!
By Wendy Bowman
With their fierce jaws and cunning hunting tactics, spotted hyenas don't seem to have much to joke about. So what do those spine-chilling peals of laughter really mean?
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Seals have long been known as dry-land clappers, but the first-ever percussive clapping observed by scientists has blown seal clapping theory out of the water. Or should we say under the water?
The maned wolf might as well be called a werewolf given its unfortunate name. You see it's not a wolf at all, and despite all appearances, it isn't a fox either.
By Mark Mancini
The polar bear's shocking whiteness, ferocity and sheer size make it an icon of purity and power. How do these animals survive in a frigid climate?
But, squirrels that strongly prefer one hand over the other aren't as good at learning, one study suggests. What does this mean for you and me?
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"Pure coyotes" are now much rarer than what we would consider coyote-wolf hybrids, or coywolves.
Elk are some of the most majestic animals in the world, but also some of the most aggressive. Here's what you need to know about the territorial elk.
With lightning speed and incredible vision, the cheetah is the fastest land animal on Earth and the best hunter on the savanna.
It may be the world's smallest fox, but its ears give it a huge hearing advantage.
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Reindeer are, of course, best known for their main gig om Christmas Eve every year, but there's more to them than just their flying and sleigh pulling prowess.
Beaver attacks get a lot of media attention but are beavers really crazed killers that we should be afraid of? And what good do they really do?