People or animals that can move through water using their limbs or body in a coordinated way.
From Old English 'swimman' (to move through water), possibly related to Old Saxon and Old High German words. The '-er' suffix indicates someone who does the action, so 'swimmer' is one who swims.
Humans are actually terrible swimmers compared to most animals—we have to learn it, while most mammals instinctively know how to swim! Scientists think this is because our ancestors spent so much time walking upright on land that we lost the natural swimming ability other mammals kept.
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