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
What Do Possums Eat? Most Things, It Turns Out
What's It Like Inside a Kangaroo's Pouch?
Do Kangaroos Really Box?
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?
Cheetah vs. Leopard: Can You Spot the Differences?
Bunny vs. Rabbit: Is There a Difference?
Coyote vs. Wolf: Differences in Size, Habitat and Behavior
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We've learned that young orangutans nurse for much longer than any other mammal, knowledge which could help conservation efforts.
It's the first evidence researchers have of the whales using their "unicorn horns" to capture prey.
Deprived of oxygen, naked mole rats can alter their metabolic functions to something less mammalian and more plantlike, burning fructose instead of glucose.
It's like the movie "Groundhog Day" every April, but with hibernation, a smaller rodent and way more hormones.
Rhino herds defecate in giant, shared dung piles called midden, then they stick their noses in the stuff. Here's why.
House cats seem to love chasing laser pointers. But what about their larger, wilder cousins?
Ring-tailed lemurs — perhaps the most iconic species on the tropical island of Madagascar — are in significant decline due to habitat loss, hunting and illegal capture.
Turns out the reboot of 'Planet of the Apes' got one thing right — it's the brains monkeys lack, not the anatomy.
It turns out that one of the world's most enchanting animals has even stronger superpowers than we previously knew. Surprise!
Yes, these nocturnal mammals can fly faster than our most beloved speedy birds. And they beat the record by a long shot.
In research that showed intentional expressions of desire, horses have been added to the short list of animals that can use symbols to communicate with humans.
The most popular lady macaques show us why nitpicking pays off.
Can you tell one species of giraffe from the next? We've got some pics to help you out.
For some horses and ponies, Diet Coke can be a literal lifesaver.
Hedgehog populations in Britain have dropped severely. Understanding how the animals have adapted to urban and rural spaces will help us help them.
Dutch researchers analyzed a surprising selection of exotic mammals to find which could most easily live alongside people in a humane way.
Late-stage albinism? Disastrous paint spill? Marty McFly in giraffe form? Maybe the African mammal just has something in common with Michael Jackson.
Rising sea levels wiped out the entire population of a rodent species only found on remote Australian island Bramble Cay. Who's next?
The population-control strategy to rid the islands of the invasive species would use something called "gene driving" and GMO rodents.
By Chris Opfer