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.
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.
Puma, panther, mountain cat, mountain lion, mountain screamer, painter, catamount and, yes, cougar. This cat has a lot of names!
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?
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.
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?
They have been called both “coywolf” and “coydog,” but the majority of the scientific community recognizes this hybrid animal simply as the “eastern coyote.”
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.
The smallest of the wallaby species is known to pose for selfies with tourists and be cuter than cute. But the feisty quokka has had to fight for its very survival.
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.
Whaddya get when you cross a lion and a tiger? Yep — you get a liger, of course. But why are they considered controversial?
The proverbial "king of the beasts," lions are second in size to just one other cat in the world, the tiger. But a lion's biggest fear? Tangling with a porcupine the size of a small dog.
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?
They look so cute and fluffy, but koalas have a fierce side too. Still, their biggest threat to survival is mankind.
Gorillas can live to be about 35 to 40 years old and are much gentler (and much sleepier) than you might think.
The female emu may lay the eggs, but the male emu does all the caretaking. And that's just one fascinating thing we learned.
They're weird-looking and mild-mannered, but Asian and African markets can't get enough illegal pangolin scales.
They're the cutest and most curious masked mammals around. But they also have a reputation for being a nuisance. Here's everything you need to know about the raccoon.
Sea otters are adorable, back from the brink of extinction and will totally bite you.
Move over Dracula. These fish, birds and bats really are the vampires of the animal world — and they do need to eat (or suck) blood to sustain life.
Manatees can weigh up to 1,200 pounds and reach 10 feet in length, but they're so gentle and sweet they'll break your heart.
It turns out that bobcats do just fine if not actively hunted by humans.
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