world 4 whale | 3 whales nova scotia
world 4 whale | 3 whales nova scotia Whale Whales are descendants of land-dwelling mammals of the artiodactyl order (even-toed ungulates). They are associated with the Indohyus, an vanished chevrotain-like ungulate, from which they will split approximately 48 mil years ago.|19||20| Primitive cetaceans, or archaeocetes, first took to the sea around 49 million years ago to become fully aquatic 5-10 , 000, 000 years later. What identifies an archaeocete is the occurrence of anatomical features distinctive to cetaceans, alongside other primitive features not present in modern cetaceans, such as obvious legs or asymmetrical teeth.|21||22||23||9| Their features started to be adapted for living in the marine environment. Major anatomical changes included their hearing set-up that channeled vibration from the jaw to the earbone (Ambulocetus 49 mya), a streamlined body and the regarding flukes on the tail (Protocetus 43 mya), the migration of the no...