Aquatic mammals such as whales and dolphins live and feed in the ocean. The Blue Whale is the biggest mammal on Earth.
What's the difference: seal or sea lion?
From ears to fur, seals and sea lions may be related, but they certainly aren't the same. Prove your knowledge on these cousins at HowStuffWorks. See more »
What's the difference: dolphin or porpoise?
Both dolphins and porpoises are majestic water creatures, but can you tell them apart? Check out our quiz and prove your marine animal know-how at HowStuffWorks. See more »
What makes beached whales explode?
What makes beached whales explode? Find out what makes beached whales explode at HowStuffWorks. See more »
The Contenders Quiz: Hippos
See if you can answer these true or false questions about the hippopotamus is also known as the river horse. The more you know may help you determine the ultimate river champion in the Rumble in the River. See more »
Blue Whales are the largest animals in the world. Learn more facts about the Blue Whale at HowStuffWorks. See more »
Harp Seals can weigh up to 320 pounds. Learn more about the harp seal at HowStuffWorks. See more »
The Leopard Seal gets its name from the leopard-like dark spots on its coat. Learn more about Leopard Seals at HowStuffWorks. See more »
Northern Right Whale
Northern Right Whales have growths called callosities that are as unique as fingerprints. Learn more about this mammal at HowStuffWorks. See more »
Striped Dolphins belong to the Balaenopteridae family. Learn more about this dolphin at HowStuffWorks. See more »
The Walrus is common aquatic mammal. Learn facts about the Walrus at HowStuffWorks. See more »
Loading more content
NASA Urges You to Get Your Butt to Mars ... and Other Exciting Destinations
Discovering the Chemistry of Space Through Telescopes
Viking Toilet Worm Investigation Finds Genetic Clues to Emphysema's Origins
Volvo's Death-proof Promise Is Nothing New
Two New Studies Find Potential Harmful Effects of E-Cigarettes
U.S. Coins Display No Numerical Values — Not Even the Government Knows Why
See More Headlines »