X 



CONTENTS 



Page 



89. Finally aroused, the male moved ahead of the 



female while she prodded him toward the water 223 



90. This adult male was tolerant of a deserted juvenile 



which slept beside him 224 



91. Phases in the reproductive cycle of the female sea otter 231 



92. Early fetal stages of the sea otter 232 



93. Intermediate fetal development 233 



94. Estimated period of implanted pregnancy 237 



95. The counts and estimates of dead sea otters on 



Amchitka beaches indicate the order of magnitude 



of annual mortality 251 



96. Observed mortality of sea otters at Amchitka 



Island, 1955-63 254 



97. Mortality of sea otters at Amchitka Island during 



weekly intervals through period of high 



mortality in 1959 and 1962 256 



98. A moribund juvenile sea otter 256 



99. This aged male sea otter sought escape from a 



high wind in a sheltered cove 257 



100. Age and sex of sea otters dying in the winter-spring 



period of 1961-62 259 



101. Age and sex of sea otters dying in the 



winter-spring period of 1958-59 260 



102. Average seasonal mortality of 311 otters found 



dead on Amchitka beaches 1955-63, and average 

 monthly wind velocities in the outer Aleutian 

 Islands measured by the U. S. Weather 



Bureau, 1960 through 1963 264 



103. Daily record of surf conditions and of otters found 



dead on the Pacific coast of Amchitka 



from 14 January through 30 April 1962 265 



104. Daily record of observed surf condition and otters 



found dead on the Bering Sea coast of Amchitka 



Island from 19 January through 30 March 1962 265 



105. After a sea otter was netted, a carrying cage was 



placed horizontally on the rocks and the otter was 



allowed to move from the net into the cage 286 



106. This 65-lb. male was carried for over a mile 



in this manner 287 



107. In 1955, before it was learned that fur of the sea 



otter quickly lost its waterproof qualities when 

 otters were carried in dry bedding, these animals 

 were transported from Amchitka to the Pribilof 



Islands as shown 289 



108. This enclosure around a cement pool satisfactorily 



prevented escape and furnished ideal conditions 



where otters could be held indefinitely 290 ■ 



109. The cement pool in the enclosure where otters 



were maintained in excellent health 291 



110. Air temperatures down to +15° F. were withstood 



with no apparent detrimental effects by captive 



otters in the outdoor pool 292 



