A sleek, fast-moving baleen whale that lives in oceans worldwide and is the third-largest animal on Earth.
From Norwegian 'sei' or Japanese 'seiji.' The name comes from Scandinavian whalers who used local names for whale species they hunted.
Sei whales can swim at speeds over 30 mph, making them the fastest cetaceans—they're so quick that whalers historically left them alone in favor of slower, easier targets, which actually helped sei whale populations survive longer.
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