Furry aquatic mammals with long sleek bodies, small ears, and powerful tails that hunt fish and shellfish in rivers and seas.
From Old English 'otor' or 'otter,' from Proto-Germanic 'otraz.' The word root likely means 'swimmer' and is related to 'water' in many Indo-European languages.
Sea otters are a 'keystone species'—they eat sea urchins, which otherwise destroy kelp forests, so when sea otters disappeared from hunting, entire ocean ecosystems collapsed until we brought them back.
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