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Updated: May 13, 2025
MARINE MAMMALS. The carnivorous mammals of the sea whales, seals, walruses, etc. seem to have been derived from some of the creodonts of the early Tertiary by adaptation to aquatic life. Whales evolved from some land ancestry at a very early date in the Tertiary; in the marine deposits of the Eocene are found the bones of the Zeuglodon, a whalelike creature seventy feet in length.
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