1. Dolphins sleep by resting one half of their
brain at a time.
2. A dolphin's tail doesn't have any bones, but it is full of muscles.
3. Dolphins 'hear' through a special bone in their lower jaw.
4. The bones inside a dolphin's flippers are similar to the bones inside your arm and hand.
5. Dolphins breathe air using a special hole, called a blowhole. On top of their head.