Dolphins surf ocean waves purely for fun — one of the clearest signs of play behavior in animals.

The Great Barrier Reef is the largest coral reef system in the world.

Fact #13 · Ocean

The Great Barrier Reef supports thousands of marine species.

Fact #186 · Ocean

Blue whales are the largest animals known to have ever lived.

Fact #246 · Ocean

There is a river in the ocean — the Gulf Stream moves more water than all of Earth's rivers combined.

Fact #3404 · Ocean

Moose have large antlers used during mating season.

Fact #1272 · Ocean

The sea turtle’s streamlined shell aids in efficient swimming.

Fact #903 · Ocean

Some seals can sleep underwater by surfacing periodically.

Fact #1290 · Ocean

Sea lions can rotate their rear flippers forward to walk on land.

Fact #1245 · Ocean