Starfish have eyes at the end of their arms.
There are whales alive today that were born before Moby Dick was written in 1851.
Anglerfish have black-lined stomachs to stop their insides from giving them away after they eat something luminous.
Eel blood is toxic to humans.
The pistol shrimp uses jets of water to generate a sonic boom as loud as Concorde’s.
Alligators’ penises are permanently erect, but concealed inside their bodies.
A startled hagfish can unleash more than five gallons of defensive slime.
Dolphins can stay awake for 15 days at a time.
An octopus has horizontal pupils; whatever angle the octopus is at, its pupils always stay aligned with the horizon.