Dolphin animals

    Dolphins are marine mammals that are closely related to whales and porpoises. There are almost forty species of dolphin in seventeen geaner. They vary in size from 1.2 m (4 ft) and 40 kg (90 lb), up to 9.5 m (30 ft) and 10 tonnes. They are found worldwide, mostly in the shallower seas of the continelnta shelves, and are carnivores, mostly eating fish and squid. The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about ten million years ago, during the Miocene. Dolphins are considered to be amongst the most intelligent of animals and their often friendly appearance and seemingly playful attitude have made them popular in human culture.Dolphins are often regarded as one of Earth's most intelligent animals, though it is hard to say just how intelligent dolphins are, as comparisons of species' relative intelligence are complicated