Approximately when did the evolutionary journey of pinnipeds begin?
Answer
The Eocene epoch, about 50 million years ago
The evolutionary journey of pinnipeds commenced in the Eocene epoch, roughly 50 million years ago, originating from four-legged, otter-like carnivores.

#Videos
The Evolution of Seals, Sea Lions, and Walruses - YouTube
The Evolution of Seals - YouTube
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