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One extinct animal that was common on the west coast around 5 million years ago is the marine mammal known as the Steller's sea cow. This large herbivorous animal, related to modern manatees and dugongs, inhabited the shallow coastal waters of the North Pacific. Steller's sea cow was hunted to extinction by humans in the 18th century, but it once thrived in the kelp forests along the west coast. Its extinction highlights the impact of human activities on marine ecosystems.

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