Sea otters use rocks as tools to break open shellfish.

The immortal jellyfish (Turritopsis dohrnii) can revert to its juvenile state after reaching adulthood.

Fact #3244 · Ocean

The deepest part of the ocean is approximately 35,876 feet down.

Fact #2590 · 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

The anglerfish uses a bioluminescent lure to attract prey in the dark ocean depths.

Fact #1383 · Ocean

Some deep-sea octopuses brood their eggs for years.

Fact #1413 · Ocean

Glacial periods caused sea levels to drop significantly.

Fact #748 · Ocean

Dolphins can recognize themselves in mirrors.

Fact #1295 · Ocean

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

Fact #246 · Ocean