Whale
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Whale (origin Old English hwæl) is the common name for various marine mammals
of the order Cetacea. The term whale sometimes refers to all cetaceans,
but more often it excludes dolphins and porpoises, which belong to
suborder Odontoceti (toothed whales). This suborder also includes the
sperm whale, killer whale, pilot whale, and beluga whale. The other
Cetacean suborder Mysticeti (baleen whales) are filter feeders that eat
small organisms caught by straining seawater through a comblike
structure found in the mouth called baleen. This suborder includes the
blue whale, the humpback whale, the bowhead whale and the minke whale.
All Cetacea have forelimbs modified as fins, a tail with horizontal
flukes, and nasal openings (blowholes) on top of the head.
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