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Animals | Wild Animals | Aquatic Mammals

Aquatic mammals such as whales and dolphins live and feed in the ocean. The Blue Whale is the biggest mammal on Earth.

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How Walruses Work

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?


From Fin Whales to Blue Whales: The Whale Species Quiz

From Fin Whales to Blue Whales: The Whale Species Quiz

Whales are some of the biggest creatures on Earth. Test your knowledge of whale species with this quiz at HowStuffWorks. See more »

The Unicorn of the Sea: Narwhal Quiz

The Unicorn of the Sea: Narwhal Quiz

The narwhal is often called the unicorn of the sea. Test your knowledge of the narwhal with this quiz at HowStuffWorks. See more »

What's the difference: seal or sea lion?

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?

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?

What makes beached whales explode? Find out what makes beached whales explode at HowStuffWorks. See more »

The Contenders Quiz: Hippos

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 Whale

Blue Whales are the largest animals in the world. Learn more facts about the Blue Whale at HowStuffWorks. See more »

Harp Seal

Harp Seals can weigh up to 320 pounds. Learn more about the harp seal at HowStuffWorks. See more »

Leopard Seal

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 »