Semi-aquatic marine mammals including seals, sea lions, and walruses that have flippers and divide their time between water and land. They are excellent swimmers and divers.
From Latin 'pinna' meaning 'fin' or 'feather' and 'ped' meaning 'foot', literally 'fin-footed'. The term was coined in the 19th century to describe these flipper-footed marine mammals.
Pinnipeds are the ocean's breath-holding champions, with some species able to dive over a mile deep and hold their breath for more than two hours! They've evolved special blood chemistry that allows them to store enormous amounts of oxygen in their muscles.
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