Marine Mammals
Aquatic mammals such as whales and dolphins live and feed in the ocean. The Blue Whale is the biggest mammal on Earth.
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?
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 2
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
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?
Bushy mustaches like the ones that Magnum P.I. or Super Mario sport are a bold fashion statement. But for baleen whales, they never go out of style.
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Each year, thousands of male Pacific walruses pack the beaches of Round Island off the coast of Alaska. Is there a reason for this months-long male bonding?
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
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?