Whale sharks are the world's largest fish — reaching 18 meters — and feed exclusively on plankton.

A whale shark is the largest fish in the ocean.

Fact #462 · Ocean

Dogs can smell certain diseases such as cancer.

Fact #2538 · Ocean

The mimic octopus can imitate other sea creatures.

Fact #355 · Ocean

Octopuses can open jars to access food inside.

Fact #1298 · Ocean

Certain dolphins cooperate to herd fish in coordinated groups.

Fact #1301 · Ocean

Sea horses swim upright rather than horizontally.

Fact #446 · Ocean

Some volcanoes can erupt underwater.

Fact #2624 · Ocean

Many deep-sea fish have transparent or nearly invisible bodies.

Fact #1387 · Ocean