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  1. anatomypubs.onlinelibrary.wiley.com › doi › fullEvolution of marine mammals: Back to the sea after 300 million...

    May 21, 2007 · Evolution of marine mammals: Back to the sea after 300 million years. Mark D. Uhen. First published: 21 May 2007. https://doi.org/10.1002/ar.20545. Citations: 144. Sections. PDF. Tools. Abstract. The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions.

    • Mark D. Uhen
    • 144
    • 2007
    • 21 May 2007

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  3. evolution-outreach.biomedcentral.com › articles › 10From Land to Water: the Origin of Whales, Dolphins, and ...

    Apr 16, 2009 · Cetaceans (whales, dolphins, and porpoises) are an order of mammals that originated about 50 million years ago in the Eocene epoch. Even though all modern cetaceans are obligate aquatic mammals, early cetaceans were amphibious, and their ancestors were terrestrial artiodactyls, similar to small deer.

    • J. G. M. Thewissen, Lisa Noelle Cooper, Lisa Noelle Cooper, John C. George, Sunil Bajpai
    • 2009

  4. uvm.edu › ~dstratto › bcor1021 Phylogenetic History: The Evolution of Marine Mammals - WRUV

    Figure 1. Harbor seal, walrus, dugong, and right whale) The first mammals were certainly terrestrial. There is good evidence that mammals evolved from reptile-like ancestor. Therefore at some point there was a transition from terrestrial environment to an aquatic lifestyle in this group of species. How did that occur?

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  5. link.springer.com › article › 10A Brief History of Marine Mammals | Journal of Mammalian ...

    Oct 18, 2012 · University of California Press, Berkeley, CA. 2012. 205 pp., $49.95 (cloth), $25.62 (Kindle). ISBN 9780520270572. Annalisa Berta leads readers through a vast range of topics regarding the evolution of marine mammals in Return to the Sea: The Life and Evolutionary Times of Marine Mammals. In this volume geared towards non-specialists (one might ...

    • Mark D. Uhen
    • muhen@gmu.edu
    • 2013

  6. www.pbs.org › wnet › natureOcean Giants | Going Aquatic: Cetacean Evolution - PBS

    Mar 21, 2012 · When did scientists first propose that marine mammals evolved from land-living mammals? What findings led to this conclusion?

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  7. link.springer.com › chapter › 10Return to the Sea: The Evolution of Marine Mammals

    Nov 15, 2019 · However, another hypothesis is that Odobenidae first evolved in the North Pacific and then dispersed into the Arctic Ocean and North Atlantic during an interglacial event in the Pliocene or Pleistocene.

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  9. www.nationalgeographic.com › article › rise-mammalsRise of Mammals Article, Mammal Evolution Information, Facts ...

    Only humans can ask that question, or hope to answer it. We are, in a sense, the ultimate mammals. To be sure, we share defining traits with the first mammals—traits that were evolving even as ...