The Archaeoceti or "ancient whales" are extinct and known only by fossils. The Odontoceti or "toothed whales" have either
numerous, uniform and conical teeth, asymmetrical skull and single nasal passage. The Mysticeti or "baleen or whalebone
whales" are named after their feeding apparatus; a series of transverse plates of comb-like baleen (made of similar material
to that of the human fingernail) which descend from the roof of the mouth and serve to strain plankton and small fish.
Other distinctive characteristics of the baleen whales include a symmetrical skull with no melon (the apparatus used by
odontocetes for echolocation) and a pair of nasal cavities . . .
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