Dolphins (Sotalia) (Delphinus) (Tursiops) and whales {Cetacea} live in ocean and have blubber.
limbs
Forelimbs are fin-like. They have no hind limbs.
respiration
Cetaceans have one or two blowholes on head top.
teeth or baleen
Some Cetacea (Odontocetes) have teeth: sperm, pilot, and beluga whales, and dolphins and porpoises. Some Cetacea (Mysticetes) have baleen: blue and fin whales. Extinct ancestors belong to Archaeocetes.
whales
Sulfur-bottom whale is 150 tons and 35 meters long. Narwhal has long horn. Humpback whale, finback whale, gray whale, and blue whale are other whales.
dolphins
Dolphin has directional sonar, useful up to mile. Porpoise is like dolphin. Orca or killer whale is large dolphin. Dolphins shed soft flaky skin every two hours.
evolution
Cetacea evolved from artiodactyls.
Biological Sciences>Zoology>Kinds>Cetacean
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Date Modified: 2022.0224