Dolphins are mammals that live in the ocean and river water are closely related to whales.There are nearly 40 species of dolphin in seventeen genera live in the ocean, the few remaining living in some of the world's rivers (Yangtze River, Amazon River, the Indus, the Ganges, etc.).The size of the dolphins can range from 1.2 m (4 ft) và40 kg (90 lb) (Maui's dolphin), up to 9.5 m (30 ft) and 10 tonnes (9.8 tons; 11 tons of missing) (big black's dolphin or killer whale).The dolphins have across the world and usually reside in the shallow seas of the continental shelves.The dolphins are carnivores, mostly eating fish and squid.They whales oceans Delphinidae is the largest family in the dolphins and they also appear later: about 10 million years ago, in the Middle.Dolphin is one of the most intelligent animals and are known in human culture thanks to the friendly form and mischievous attitude.
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