15 Things You Didn't Know About Dolphins :

15 Things You (Probably) Didn't Know About Dolphins :

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1. Dolphins can see with sound, they use their tell-tale clicks which travel long distances and bounce off of objects. This allows them to know how far away the object is and the shape, density, movement and texture of it.

2. Dolphin sonar is the best within nature and superior to bats sonar and man-made sonar.

3. While sleeping, a dolphin must stay at the surface so its blowhole is not covered with water and it only switches off one side of its brain to keep breathing and staying alert.

4. "The Cove" is an academy award winning documentary about the treatment of dolphins in Japan. It discusses cruelty towards dolphins and the strong risks of mercury poisoning from eating dolphin.

5. Dolphins were thought to be a lot smaller hundreds of years ago, it is also thought that echolocation is an evolutionary process and that dolphins haven't always had this ability.

6. Dolphins do not use their 100 teeth for eating, rather for catching the fish which they then just swallow whole. They actually don't have jaw muscles for chewing!