Usually sea otters have their pup in late spring. A pup is a light brown color and weighs three to five pounds. The year the female cares for the pup, the pup travels with her nad stays close by at almost all times. By the time the pups are weaned they look full grown and weigh up to 30 pounds. A female has a pup about every two years.
Sea otters are well adapted to live in shallow waters along the mainland.
Sea otters do not have an insulating layer of blubber like most marine mammals. They maintain their body heat by their dense fur, which traps a layer of insulating air next to their skin. If the sea otter furs become matted by material such as oil, the insulating qualities are lost. This results in loss of body heat and eventually death. For this reason, sea otters spend much time rubbing and cleaning their fur.