Marine Reptiles, Birds, Mammals. Marine Reptiles, Birds, Mammals – Fig. 9-1. Ancestors of these various animals re-invaded oceans after evolving adaptations to life on land. They had to make a transition back to the ocean Four limbs two limbs (flippers)
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Marine Reptiles, Birds, Mammals
Sperm Whale - toothed
Blue Whale – filter feeder; largest animal