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.
How Often Do Whales Come Up for Air?
How Do Whales Sleep? They're Always Half Awake (Literally)
Are Whales Mammals? Yes, and They're Related to Hippos
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)
Mountain Lion vs. Bobcat: A Big Cat Showdown
Panther vs. Jaguar: Kind of Like Saying 'Apple vs. Granny Smith'
Siberian Tiger vs. Bengal Tiger: A Showdown of Big Cats
Hippo vs. Rhino: Who Comes Out on Top?
6 Types of Horses for Riding, Racing and Farm Work
Ram vs. Goat: Horns, Tails, Temperaments and More
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
Beaver vs. Groundhog: Brown Rodents With Very Different Homes
Is the Rat King Real or Simply an Urban Legend?
What Do Groundhogs Eat?
Wolverine vs. Badger: An Intensely Scrappy Showdown
What Do Skunks Eat? Just About Anything They Find
What Do Raccoons Eat? You Won't Be Surprised
Learn More / Page 14
Vindictive whales like Moby Dick sometimes give these giants of the sea a bad rap. But whales do a lot for their ecosystem, especially after they go to Davy Jones' locker.
What? You've never heard of a narwhal? Well, it's a cold-water-dwelling, deep-diving, vocalizing, halibut-munching wonder with its very own ivory crown. Did we mention its crazy tusk?
Loners might seem intriguing, but they lead dangerous lives -- a least those in the wolf world do. Lone wolves are outsiders, relying only on themselves to survive without a pack.
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Riddle me this: Why are bats showing up dead with a white powder streaked across their faces? Could a poorly understood fungus wipe them out? To the bat cave, readers!
So far, "Planet of the Apes" is pure fiction. But are chimps capable of learning human language (and eventually taking over the world)?
Million-dollar endorsement deals or a sneaker named the Air Roo aren't in the cards for kangaroos. Since these animals can't play in any Final Four championships, why do they hop?
These reindeer won't find any candy canes or fruitcake buried in the frozen tundra. So how do these animals find enough food to sustain them through such extreme weather?
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Elephants have amazing memories and are known to hold grudges for years against those who have wronged them. So, be careful who you're calling Dumbo.
Animals may not have access to spice racks, but does that mean they don't enjoy flavorful meals? Have Japanese monkeys discovered the joy of cooking, or is this a culinary myth?
Plagued by negative images and slanderous tales, wolves could use the help of a good publicist. Will positive news like wolves help strengthen the ecosystem override age-old fears and misconceptions?
What's a full moon without the cry of a wolf echoing in the background? Are wolves really howling at the moon or just talking among themselves?
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Wolves are wild predators and could kill your beloved Fido for a tasty meal. But will these animals come after you, or do they prefer a drama-free neighborhood?
Contrary to popular belief, the leaders of a wolf pack aren't always hyper-aggressive social climbers. The truth is more nuanced, and more interesting.
Wolves may be a close relative of man's best friend, but we wouldn't recommend trying to befriend these wild canines. Check out this wolf image gallery to learn all about different wolf species and their habits.
By Marie Bobel
This big cat image gallery shows you a wide variety of these carnivorous felines. From the well known tiger and lion to the lesser known serval and margay, learn about these big cats and their relatives.
By Marie Bobel
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Though some things aren't always black and white, zebras remain the exception. These animals are known for their classic colors, but are zebras black with white stripes or white with black?
The king of the jungle has been known to salivate at the sight of a tasty human. But are these stories of lions wreaking havoc on people in Africa true?
Any animal that can go from zero to 40 mph in three strides must have a very specialized body. Why can cheetahs run so fast, and how does their ability make them vulnerable?
By Julia Layton
A good portion of a giraffe's height comes from its statuesque neck. But how do these lanky creatures get their necks in such pretzel-like positions?
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If you can get past a koala's pungent scent of urine and mating-musk, you might detect a faint hint of cough drops. Why do koalas smell like they'd clear out your sinuses?
By Julia Layton
Dog shows aren't the only places you'll hear barking and clapping. Seals and sea lions welcome beachgoers with their uproarious get-togethers. But how do you tell the difference between the two?
They call the creature a bear. And bears are known to hibernate each winter. So why don't pandas slip into the same cold-weather stupor? Are they really even bears at all?
By Jane McGrath
Dolphins and war? That seems like an unfortunate pairing. But the U.S. Navy has been training the gregarious sea creatures to spot sea mines since the 1960s. Are they good at it?
By Jane McGrath
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Some people call orcas the wolves of the sea, yet others want to swim with them. Why are these animals known as killers -- or are they just getting a bad rap?
If your favorite diner's blue plate special is ever sauteed polar bear liver, you may want to stick with salad. This meal can cause symptoms far beyond indigestion.
By Robert Lamb