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  1. 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 ...

  2. 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
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  4. 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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  5. Jan 17, 2018 · Marine Mammal Groups. The cetaceans have evolved to become the dominant group of marine mammals, with the highest levels of taxonomic and ecological diversity, as well as the widest geographic range. They evolved from a group of hoofed terrestrial ancestors within the order Artiodactyla more than 50 million years ago during the Eocene period.

  6. Evolution of Marine Mammals: Back to the Sea After 300 Million Years MARK D. UHEN* Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC ABSTRACT The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions. Five of these clades are still

    • Mark D. Uhen
    • 152
    • 2007
  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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