Though sea spiders have thrived for millions of years in a variety of marine conditions—in cold Antarctic waters, on deep ...

What are the most aggressive animals? Discover the fiercest creatures that rule the land, sea, and sky with unmatched power, instincts, and survival tactics.

There are millions of animals all around the world. The smallest land animal is the Etruscan shrew. The smallest sea creature is the zooplankton.

If you've ever wondered what would happen if a cow carcass got dropped into the South China Sea, you've come to the right ...

Guinness World Records reported the oldest land-living animal, Jonathan, is a 190-year-old tortoise, making him the oldest turtle ever.

Whether by land or by sea, there are plenty of animals big enough to humble even the mightiest among us. Learn more about the largest animal in the world below, along with its scrawny counterpart ...

With time, the back-to-the sea creatures would give rise to animals vastly different from their land-trotting kin: They became the magnificent whales, dolphins, and porpoises that glide through ...

True crabs evolved to migrate between marine and land environments multiple times throughout their 250 million-year-old history, new study finds.

Seagrasses evolved from terrestrial plants that returned to sea yet retained some of their land features, such as flowering. And, apparently, relying on animals for pollination.

[Related: Our four-legged ancestors evolved from sea to land astonishingly quickly.] Animals blink to keep the eyes wet and clean and protect them from injury.

Ever wondered about the world's fastest animal? Wonder no more. Here is your guide to nature's speediest creatures by land, air, and sea.