whale tattoo | 7d whale in school Whale Whales are descendants of land-dwelling mammals of the artiodactyl purchase (even-toed ungulates). They are linked to the Indohyus, an extinct chevrotain-like ungulate, from which that they split approximately 48 , 000, 000 years ago.|19||20| Primitive cetaceans, or archaeocetes, first took to the sea approximately 49 million years ago and became fully aquatic 5-10 , 000, 000 years later. What specifies an archaeocete is the occurrence of anatomical features unique to cetaceans, alongside other primitive features not found in modern cetaceans, such as obvious legs or asymmetrical pearly whites.|21||22||23||9| Their features became adapted for living in the marine environment. Major anatomical changes included their reading set-up that channeled vibration from the jaw to the earbone (Ambulocetus 49 mya), a streamlined body and the growth of flukes on the tail (Protocetus 43 mya), the alpage of the n...
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