The tongue of a blue whale weighs as much as an elephant and its heart is the size of a small car.

A hippopotamus can hold its breath underwater for several minutes.

Fact #433 · Ocean

There are more atoms in a glass of water than glasses of water in Earth's oceans.

Fact #2617 · Ocean

Some deep-sea species have extremely slow metabolisms.

Fact #1403 · 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

The Pacific Ocean is the deepest ocean on Earth.

Fact #337 · Ocean

Bioluminescence is common among deep-sea organisms.

Fact #1418 · Ocean

The Caspian Sea is the world's largest inland body of water and is classified as a lake despite its salt water.

Fact #3759 · Ocean