TIME 1800 1900 2000 2100 2200 2300-0600 



NO. OBS. 174 163 167 159 173 332 



Figure 118. — Behavior of an adult female sea otter during a mean or average 

 night. The mean percent of 1,168 observations of the animal in three 

 locations during the night are shown. 



spent in the water increased until in June he spent about 90 

 percent of his time there. 



Causes of Death in Captivity 



This subject was discussed in the foregoing pages in relation to 

 environmental needs of captive otters. 



The terminal symptom noted at death was often the voiding of 

 black, tarry feces. Necropsy revealed enteritis (Stullken and Kirk- 

 patrick, 1955). 



K. L. Binkley, D.V.M., described the condition he found in three 

 adult or near adult otters which he transported from Amchitka 

 Island on a commercial, passenger-carrying aircraft (from a 

 typewritten report dated 5 November 1957, in the files of the 

 U.S. Fish and Wildlife Service) : 



Cause of death; acute pulmonary hemorrhage. Predisposing factors; high 

 altitude flying in a nonpressurized plane, and promazine induced tranquility. 



