1. Dolphins have an extraordinary ability. The sound waves they emit can "visit" underwater things. However, dolphins have no external ear, only a small hole as big as a needle eye behind their eyes. Sound travels through a slender "window" in the jawbone.

2. Dolphins can swim at an amazing speed, up to 20 miles per hour, which is related to the fact that their skin can fluctuate in waves according to the water pattern. Dolphins are diving experts. It can dive at a high speed of 14 meters per second, and can leave ordinary submarines behind. Dolphins are also natural enemies of sharks.

Dolphin is a marine mammal with superior ability and intelligence. After training, I can play table tennis, jump in the ring of fire and so on. Dolphin's brain is the most developed among animals except humans. Human brain accounts for 2. 1% of his body weight, and dolphin brain accounts for 1.7% of his body weight.

The dolphin's brain consists of two completely separate parts. When one part is at work, the other part gets enough rest, so it can stay awake for life.

Dolphin is an aquatic mammal, closely related to whales and porpoises. It evolved in Miocene about 65438+ 1 100 million years ago, widely lived in shallow waters near the continental shelf, and was occasionally found in fresh water. Mainly feed on fish and mollusks.

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Baidu encyclopedia-dolphin