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  1. Jul 08, 2019 · In fact, these huge, lumbering beasts evolved from the tiny, mouse-sized mammals that survived the K/T Extinction 65 million years ago. And the first mammal even remotely recognizable as a primitive elephant didn't appear until five million years after the dinosaurs went kaput.

  2. 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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    • Moeritherium. Moeris beast. Early 1900s. Charles Williams Andrews. 1901. North America. Time Lived.
    • Deinotherium. Terrible Beast. Early 1800s. Johann Jakob Kaup. 1829. What is now Africa, Asia, and Europe.
    • Gomphotherium. Welded Beast. Early 1800s. Hermann Burmeister. 1837. What is now North America, Europe, Asia, and Africa.
    • Woolly Mammoth. No meaning. Late 1700s. Joshua Brookes. 1828. What is now North America, Europe, Asia.
  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.

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  5. Feb 01, 2019 · Marine mammals are found in marine ecosystems around the globe. They are a diverse group of mammals with unique physical adaptations that allow them to thrive in the marine environment with extreme temperatures, depths, pressure, and darkness. Marine mammals are classified into four different taxonomic groups: cetaceans (whales, dolphins, and porpoises), pinnipeds (seals, sea lions, and ...

  6. 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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