Fact : #11
Dolphins Dolphins are a group of sea mammals closely related to whales. Both animals belong to the order cetacea. To keep their bodies warm, dolphins have evolved a thick layer of blubber. Every few minutes, dolphins have to surface to breath, a blowhole on top of their heads exhales used up air and inhales fresh air. There are over 40 different species of dolphins. Dolphins are fast swimmers, some of them can top 50 kilometers per hour! They move by beating their powerful tails, or flukes, up and down. The dorsal fin and flippers help them steer. Their dominant sense is echolocation. An organ, called a melon, in their foreheads emits a series of clicks. The dolphin senses the return wave though it's jaw Dolphins are also social anima...