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Museum Quality Pinnipedia Skulls: Sea Lion Skulls, Seal Skulls, Walrus Skulls.

Recent molecular evidence suggests that pinnipeds evolved from a bearlike ancestor about 23 million years ago during the late Oligocene or early Miocene epochs, a transitional period between the warmer Paleogene and cooler Neogene period.[1] The earliest fossil pinniped that had been found is Enaliarctos, which lived 24 – 22 million years ago.