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Radio telemetry engineering, design and development has recently focused on high power transmitters, ultrasonic receivers and transmitters, corrosive links, high frequency transmitters and implanted transmitters. Ranges from implanted transmitters are approximately 4 to 10 times less than from external transmitters due to fundamental limitations of small antennas. Social organization, movements, activities, foraging strategies, and population dynamics of sea otters (Enhydra lutris) were investigated from 1979 to 1982 in Prince William Sound, Alaska. Otters in newly occupied male areas spent 23% less time feeding but obtained 38% more calories per day than otters in the area of prolonged occupation where food was less abundant. Reduction of boat traffic during winter in most recently occupied male areas prompted large seasonal influexes of otters. Females were capable of reproducing annually, but rarely did so under food-stressed conditions. The population segment in the male areas increased at a rate of 50% per year as male pups dispersed from all parts of the Sound into this region, and few animals died. (ERA citation 09:020815)