Sea otters are polygynous, which means that males have multiple female partners. When a pair start making eyes at each other, they'll bond and eventually mate over the course of a few days. Mating is typically aggressive, with the female hissing and growling and the male biting the female's nose and sometimes holding her underwater. A practical result of this is that researchers will use the scar on an otter's nose to identify individual mature females.
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