remainder of the Islands of Four Mountains which have not been surveyed. 
6. Estimates based on 1956-57 sample counts, several older counts, 
and extrapolation of these various figures had placed the otter popula- 
tion in Alaska at from 32,000 to 50,000 animals. Estimates for all of 
Alaska based on the best up-to-date surveys now available place the 
figures at 20,000 to 30,000 otters. After certain areas, still in- 
adequately surveyed, have been studied the estimate might be raised 
slightly. 
7. Studies of population dynamics and movements of sea otters, 
primarily by aircraft observation, supplemented by shore and boat 
counts and shore-based detailed studies, should be continued. 
12 
