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)
Black-footed Cat: A Tiny and Ferocious Predator
The Bengal Tiger Lives in Swamps, Forest and Grasslands
Coyote vs. Fox Traits: Which Wild Animal Is Bigger?
What Do Deer Eat During Different Seasons?
What Do Camels Eat in Desolate Deserts?
Elk vs. Moose Antlers and Mating Behavior (Yes, They're Related)
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?
What Do Gorillas Eat? How Are They Such Muscular Herbivores?
The Tarsier Is One Weird Primate, and Yes, We're Related
Marmosets Are Tiny, Upper Canopy-dwelling Monkeys
What Do Groundhogs Eat?
What Do Squirrels Eat (Aside From Nuts)?
What Do Rats Eat? Whatever They Can Get Their Paws On
What Do Foxes Eat When They're Not Raiding Your Garden?
Hedgehog vs. Porcupine: Similarly Spiky Animals With Big Differences
What Is the Biggest Cat in the World? Top 9 Species in the Wild
Learn More / Page 8
Koala populations in Australia are in decline, in part due to the ravages of chlamydia, a sexually transmitted bacterial infection.
By Carrie Tatro
It pays to be brainy when you're a ring-tailed lemur.
The platypus may look a bit absurd and bizarre, but its milk might hold the secret to fighting antibiotic-resistant bacteria.
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Nutria are jumbo-sized rodents that reproduce and eat at a jumbo-sized pace.
Urban coyotes have a fierce and formidable reputation as midnight predators, but coexistence with humans is possible.
By Carrie Tatro
Some people mistakenly believe that if chimps are socialized from an early age, they're not a threat to humans. But these five families found out the hard way that chimps will always be chimps.
Why do squirrels exhibit behavior that can get them killed by cars? And how can you avoid them?
By Jamie Allen
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The first new rat species found in the Solomon Islands in 80 years has been uncovered. But due to deforestation of its habitat, very few may still exist.
Fall is in full swing and that means squirrels are busy hoarding nuts for winter. So how do they remember where they buried them? Research suggests they use mnemonic strategies.
By Jamie Allen
Due to a quirk in their anatomy, injured hedgehogs can experience skin inflating to the size of a basketball, which can be a painful and life-threatening development.
Thanks to the excesses of narcoterrorist Pablo Escobar, Colombian waterways now house a population of these invasive African giants.
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Sure, these mammals may be cute and cuddly. But that doesn't mean their bite can't pack a punch.
By frightening top predators, the fear of humans may be distorting ecosystem processes even more than previously imagined.
A new scientific study reveals that the smells unique to meerkat communities aren't produced by the meerkats themselves.
By Chris Opfer
A new genetic analysis clarifies the evolutionary relationships between five modern and extinct elephant species.
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Despite our best efforts at eradicating them, rats keep outsmarting us. Here's how.
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.
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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.
The feral pig population in the U.S. is a growing issue in nearly 40 states. The USDA hopes to wipe out the billion-dollar problem within a decade.
House cats seem to love chasing laser pointers. But what about their larger, wilder cousins?
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If you look outside your window right now, you'll probably see one running up a tree or checking you out. How did the squirrel get so commonplace?
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.