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.
Leopard Seals Are Apex Predators of the Antarctic
Humpback Whales Have Made an Amazing Comeback From Extinction
9 Enormous Facts About Sperm Whales, Gigantic Creatures of the Sea
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)
Alaska's Kodiak Bear Is One of the Planet's Biggest
What's the Difference Between a Brown Bear and a Black Bear?
How Polar Bears Work
Gray Wolves Will Get Federal Protection Again in Much of U.S.
The Serval Stands Tall and Jumps Like A Champion
Are Dingoes Dangerous (and Did One Really Eat a Baby)?
Bison vs. Buffalo: What's the Difference?
Lamb vs. Sheep: Do You Know the Difference?
Dik-dik: The Tiny Antelope With the Embarrassing Name
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?
The Tarsier Is One Weird Primate, and Yes, We're Related
Marmosets Are Tiny, Upper Canopy-dwelling Monkeys
Why Do Gorillas Beat Their Chests?
Rat vs. Mouse Identification: Which Is Eating Your Cheese?
Chipmunk vs. Squirrel Sizes, Habitats and Characteristics
How Long Do Squirrels Live?
What Is the Biggest Cat in the World? Top 9 Species in the Wild
Cheetah vs. Leopard: Can You Spot the Differences?
Bunny vs. Rabbit: Is There a Difference?
Learn More / Page 13
Monkeys and apes have lots of similarities, but they're not the same animal. In a lot of ways, it all comes down to the tail.
Until now, no one has documented a definite case of chimpanzees using tools to hunt in the traditional sense. Find out what a new study on chimpanzees may reveal about human evolution.
By Julia Layton
Did you know you conserve energy every time you walk across a room? You do, in evolutionary terms at least. Find out how and why humans began walking upright and what this has to do with our body's energy use.
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Cow flatulence produces the greenhouse gas methane, which is linked to global warming. Find out how scientists are working to reduce cow flatulence in livestock.
If you're wandering on the beach and happen upon a large mass of some sort of waxy substance, take a closer look. It could be the rare "floating gold" of the sea: ambergris. Find out whether this whale poop can help you retire rich.
By Julia Layton & Alia Hoyt
Despite their monumental proportions, the most phenomenal thing about whales isn't how big they are: It's the way they live. Whales are mammals -- warm-blooded, air-breathing creatures -- but they spend their entire life in the ocean. Find out about these awe-inspiring creatures.
By Tom Harris
Think you know what bats are all about? Chances are you're operating under at least a couple of misconceptions. Sort out the facts from the myths and see what makes bats so unique.
By Tom Harris
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Do whales and dolphins sleep? I know they have to come to the surface of the water periodically to breathe, so wouldn't they die if they dozed off?
Wallabies and kangaroos may look alike, but they're not identical marsupials. We'll tell you how to determine which is which.
The bobcat and lynx may not be much larger than the house cat lounging on your couch, but these felines rely on specific adaptations to survive in the wild.
Never wish a jockey good luck by saying "break a leg." Horses with broken legs might face a grim future, but does that mean they must be euthanized?
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As much as human beings have encroached on wildlife over recent decades, there are still several species of big cats living wild in the U.S. today.