Capybaras are considered semiaquatic — they can sleep underwater with just their nostrils above the surface.

The Pacific Ocean is home to the Mariana Trench.

Fact #276 · Ocean

There are underwater waterfalls caused by differences in water density.

Fact #2442 · Ocean

The largest animal ever known to exist is the blue whale.

Fact #914 · Ocean

Octopuses can open jars to access food inside.

Fact #1298 · Ocean

A box jellyfish has one of the most potent venoms in the ocean.

Fact #389 · Ocean

Whales are mammals and must breathe air.

Fact #265 · Ocean

Deep-sea coral reefs exist without sunlight.

Fact #1412 · Ocean

Certain marine mammals have thick blubber for insulation.

Fact #877 · Ocean