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whale cetaceans
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Whale Cetaceans

Evolution
All cetaceans, including whales, dolphins and porpoises, are descendants of land-living mammals of the Artiodactyl order (even-toed ungulates). Both descended from a common ancestor, the Indohyus (an extinct semi-aquatic deer-like ungulate) from which they split around 54 million years ago. Primitive whales probably first took to the sea about 50 million years ago and became fully aquatic about 5-10 million years later.

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Date added:Mar 08, 2016
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