The U.S. Navy has 75 trained dolphins to detect enemy swimmers and underwater mines.
The average lifespan of a dolphin is 15 years. However, some of them lived 50 years.
Male dolphins are called "bulls", and females "cows".
Dolphins sleep with one eye open.
Dolphins Recognize and Admire Themselves in Mirrors.
Dolphins give each other names and will answer to it even when called by dolphins they don't know.
Dolphins can communicate with one another over a telephone, and appear to know who they are talking to.
Dolphins and whales give birth with the tail first instead of the head.
Dolphins have the longest memory in the animal kingdom.