Mosasaurs — marine reptiles — reached 17 meters in length and dominated Cretaceous oceans.

Some whales sing songs that travel hundreds of miles underwater.

Fact #381 · Ocean

Some fish build intricate sand nests.

Fact #436 · Ocean

Noise pollution from ships disrupts whale communication over entire ocean basins.

Fact #5219 · Ocean

There are places in the ocean where pressure is over 1,000 times greater than at sea level.

Fact #2486 · Ocean

More than 70% of Earth's oxygen is produced by marine plants, primarily phytoplankton.

Fact #3399 · Ocean

Sea cucumbers can expel internal organs as a defense mechanism.

Fact #350 · Ocean

A sea anemone uses stinging cells to capture prey.

Fact #437 · Ocean

Lake Malawi contains more species of fish than any other lake in the world.

Fact #4799 · Ocean