Behavior

Social structure: Sea otters are social, and tend to congregate in groups of gender, with pups and females in a group and males in another group. Females tend to stay away from males except when mating. Sea otters can spend their whole life in the ocean but will rest on land when the population density is high. 

Development: Female otters reach sexual maturity at three years of age, and males follow at five to six years. Delayed implantation produces varied gestation times, most often between six and seven months. Adult males reach an average length of 4.5 feet (1.4 m) with a typical weight between 50 and 100 lbs (23 to 45 kg), while adult females reach an average length of 4 feet (1.2 m) and typically weigh 45 lbs (20 kg). It has a highly buoyant, elongated body, blunt snout and small, wide head. Women sea otters typically live longer than the males.