We divided the mammals into three groups:
-The sinériens (dugongs, manatees, ...) which are herbivores.
-The pinnipeds (seals, sea lions, walruses, elephant seals and leopard sharks)
Unlike terrestrial mammals, marine mammals can not breathe through the mouth. This makes it impossible to choke!
Whales breathe through nostrils located at the top of the skull (vents).
There are approximately 78 species of cetaceans classified into two major groups: toothed whales with teeth and a single vent and musticètes with baleen and two blowholes.
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