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  1. Case Studies in Ecology and Evolution DRAFT D. Stratton 2011 1 1 Phylogenetic History: The Evolution of Marine Mammals Think for a moment about marine mammals: seals, walruses, dugongs and whales. Seals and walruses are primarily cold-water species that eat mostly fish and can spend part of their time on land (or ice).

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  2. Feb 01, 2019 · Mammals evolved on land around 160 million years ago. Each taxonomic marine mammal group evolved from a different group of land mammals, whose ancestors separately ventured back into the ocean environment. Despite these different origins, many marine mammals evolved similar features — streamlined bodies, paddle-like limbs and tails ...

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  4. May 21, 2007 · Also, the two recently evolved marine mammals, the polar bear and sea otter, spend most of their time in the water feeding. This is no great surprise, because a great deal of mammalian evolution has been linked to changes in feeding ecology.

    • Mark D. Uhen
    • 152
    • 2007
  5. Jan 31, 2020 · After dinosaurs, pterosaurs and marine reptiles vanished off the face of the earth 65 million years ago, the big theme in vertebrate evolution was the rapid progression of mammals from small, timid, mouse-sized creatures to the giant megafauna of the middle to late Cenozoic Era, including oversized wombats, rhinoceroses, camels, and beavers.

    • Bob Strauss
    • Science Writer
  6. Jan 17, 2018 · Although all marine mammals evolved from land mammals, it may surprise some that each group of marine mammals has its own unique ancestry. There are three groups of marine mammals: the cetaceans (whales, dolphins and porpoises), the pinnipeds (fur seals, sea lions, walruses and seals) and the sirenians (dugongs and manatees).

  7. Evolution of marine mammals. Three mammal groups are water-dwelling animals: the cetaceans ( whales, dolphins and porpoises ), the sirenians ( manatees and dugongs) and the pinnipeds ( seals, sea lions and walruses ). Quite independently, animals from each of these groups evolved bodies designed for survival in the water.

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