Marine mammals are mammals living in the sea. There are about 120 species. This is not a specific taxonomic group: whales and dolphins are more closely related to hippos and ruminants than to other marine mammals, sirenians to elephants, while walruses, seals, sea otters and Sea lions are related to bears. As in terrestrial mammals, the breathing is aerial, they can not live without coming to breathe regularly on the surface. In addition, they have warm blood (homeotherm or endotherm), carry their young in their belly (viviparous) and finally they nurse their young.
Similar keywords: Sea Animals
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