Question

Why do sea otters float?

Answer 1

Sea Otters often float in the water surface lying on the back in a posture of seven rivers the sleep this way of an gather in groups auto sometimes float in forest of colour change series in which the internal lenses to provide Anchorage in sweerling sea

Answer 2

Sea otters float to entangle themselves to provide anchorage in the swirling sea.
Hope it will help......