Whales Evolution

591 Words3 Pages
Did you even know whales ever lived on land? The whales are the biggest animals. They are larger than the largest dinosaurs. They live in the ocean like other sea creatures, but they almost look like the land-living animals more than the fishes. Furthermore, some scientists believed that around fifty millions of years ago, the whales probably lived upon the land. There are two significant exhibits from the two different periods why the scientists astonish about whale's living is familiar to land-living mammals, which are whale's anatomy in this current period and whale's fossil remains of the past.
Firstly, the anatomy of the whales nowadays is one of the significant testimonies to attest that the whales lived on a land for a very long time ago. According to whale's anatomy, the whales have placentas for giving birth and have nipples for feeding milk to their young unlike fish that lay eggs for giving birth. They often nurse their children for two years. After that, their babies begin to eat solid food. Moreover, they have no gills because they breathe air
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From the fossil record, the first ancestor of whale name is Pakicetus. They had four limbs function for walking and no tail fluke. Then they evolved because of in-water-eating behavior became Ambulocetus. Ambulocetus still had four limbs, but their hind and tail were bigger and thicker for supporting swimming functional. The millions of years passed by, Ambulocetus became Maiacetus, which spent some time on land. However, they still had four limbs, but those were used for walking and swimming. After Maiacetus period, they developed for several millions of years became Dorudon. Dorudon was aquatic living totally. They reduced hind limb, became a fluke. Thus, those examples of the whale's fossil records have supported the assumption of the whale ancestors had four limbs and lived on the
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