The film shows different manners of behaviour of the sea otter (Enhydra lutris). A female swimming on its back nurses a young one; it turns round its longer axis while the young one follows the tit. Several Sea Otters swimming on their backs are eating big crabs. With their teeth they tear off legs and eat them, finally the carapace is licked clean. Sea Otters use clain stones thick as a fist in order to crush mussels. They lay the stones upon their bellies and beat the mussels with their forepaws many times against the stone until it breaks into pieces and the soft interior (mollusc) is eaten. Also while opening and eating mussels Sea Otters turn often round their longer axis holding stone and mussel fast.