Dolphins

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dolphin species have a distinct beck where as porpoises have a more rounded shape to there head. They also have a hooked-shaped dorsal fin not fend in other specious, as will as conical teeth.
Erans explains that evolved from the Mesonychicsi, large land mammals and the earliest recognizable cetaceans lived about 50 million year ago. The earliest did not appear install the late mioceene period, Some 11 million years ago. Evans also the land animal that is new the closest to is hooted animals called Ungulates. (27)

Dolphins can be fanned in almost every sea and ocean. Each species however has its own preferred type of habitat. Some live in only cold water, others are fanned only in tropical oceans. There is also a number of dolphin species that inhabit fresh water. These dolphins belong to the river dolphin families, like the baigi and Lndus river dolphins. However the salt-water species don�t do well in fresh water, do to the fact that they have less buoyancy in fresh ...

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