Baleen whales don't have ears, they hear through the vibrations picked up by the bones in their skull.
A dolphin's flipper is made up of five distinct bone structures, similar to that of a human hand.
Male dolphins are called bulls, female dolphins are called cows and baby dolphins are called calves.
Atolls are produced by the growth of tropical marine organisms. These type of islands are only found in warm tropical waters. It can take up to 30 million years to form an atoll.
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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).
The blue whale is the loudest animal on earth. A blue whale call can travel hundreds of miles across the water, and it is louder than an F18 jet fighter.
Out of all creatures on Earth the Giant Squid has the largest eyes; one eye can be as big as 11 inches (28 cm) across.
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 fur of sea otters can have more than 650,000 strands of hair per square inch. It helps to keep them insulated while swimming in cold waters.
The biggest beluga whale gathering happens every summer in Canada's Hudson Bay, near the city of Churchil. About 60,000 belugas gather to molt and reproduce.
Elephants use their ears to cool down. The big skin surface and moves like a fan blade and can reduce their body temperature by about 10 degrees Celsius (20 Fahrenheit).
