Penguins can drink sea water. They have glands just above their eyes which remove salt from their blood and expel it out through their nose.
The ocean sunfish can lay up to 300 million eggs at a time. Being the heaviest bony fish in the world, their weight may reach 2,200lbs (1,000kg).
Male dolphins are called bulls, female dolphins are called cows and baby dolphins are called calves.
Baleen whales don't have ears, they hear through the vibrations picked up by the bones in their skull.