Of course, being the big nerd that I am, I then held up both her hand and my hand next to it, and explained how the bones in the whale’s flipper are actually.She was able to recognize, at two years old, what so many people close their eyes to. The flippers are controlled by strong pectoral muscles and can vary in size with each species. Comparative Anatomy of Whales We can first look at the homologous structures in whales. Along the vertebral column, the lipid content is reduced, particularly in the thoracic vertebrae (~10-25%), yet greatly increases from the lumbar to the caudal vertebrae (~40-55%). In fact in some ways whales and fish are like night and day when it comes to how they live and thrive in the ocean. Defenders of evolution ask why else would a whale, which has no hind limbs, have hip bones unless they are all that remains of an ancient, land-walking, whale ancestor? In order to capture their prey, chew their food and protect themselves against threats these marine mammals possess teeth. Recent research has uncovered new details about the critical function of whale … weaving ‘batons’, chopping-boards, ‘soft’ anvils, and much more), and even for architectural purposes such as large ribs used as roof rafters. This is because the surrounding waters support their b對ody weight, so humpbacks have no need for heavy bones like land mammals … Whale bones are composed of different tissues whose composition and structure are generally comparable to those of the bones of land mammals. Unlike other mammals however whales, dolphins and porpoises have flippers, flukes, a dorsal fin and blowhole(s) that make navigating the ocean much easier. ( Log Out / The pelvic bones of whales are “one of the classic examples of a vestigial structure,” said Otárola-Castillo. Unlike sharks however whales and dolphins move forward by flexing their tail up and down, not left and right. ( Log Out / This marine mammal is a baleen whale, and all baleen whales have two blowholes. Change ), You are commenting using your Google account. Some whales also use echolocation to navigate the ocean and rely heavily on sound to observe their surroundings.
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