My Otis ciliolabrum ) may have roosted in crevices rather than in 

 the open within the cave (Kunz, 1982; Jones et al., 1983) and 

 therefore may not have been visible. Additionally, not all 

 portions of the cave are accessible to search and some bats 

 therefore may not have been detectable. The bats captured are 

 listed in Table 10. 



Little Ice Cave (T. 8 S., R. 28 E., Sec. 18, Carbon Co., MT; 

 elevation: 2494 m) is located in Douglas-fir forest on USPS land 

 about 3 km northwest of Mystery Cave. Little Ice Cave is similar 

 in the fractured rock and sinuous character of Mystery Cave, 

 although it lacks the large chambers characteristic of Mystery 

 Cave. Little Ice Cave is cool (approximately 2° C measured at 

 100 m from the entrance) and damp, although running and standing 

 water was not apparent as in Mystery Cave. The first 16 m beyond 

 the entrance are ice covered year round (Cambell, 1978). This 

 cave was entered once, on 23 August, when three roosting and one 

 dead Myotis lucifuqus were located. This cave has several 

 levels, and a fairly small portion of the cave was examined, so 

 additional bats could have been roosting in other portions of the 

 cave and been overlooked. Like Mystery Cave, this cave possesses 

 many crevices where bats could roost. At both Little Ice and 

 Mystery Caves, many of the bats captured had a great deal of soil 

 deposited on their wings and bodies, indicating that they may 

 have been roosting in crevices where their bodies were in contact 

 with the cave surfaces. Sixty-three bats were captured on 9 

 August using one 9 m and one 5.5 m net (Table 11). 



TABLE 11. — Bats Captured at Little Ice Cave. 



Total 52 11 63 



Mystery Cave and Little Ice Cave exhibited the greatest amount of 

 summer bat activity during 1989. Of the total of 316 bats 

 captured during this study, 18 3 were netted at these two 

 locations. The extensive nature of these two caves, with their 

 cool temperatures and dampness, should provide appropriate winter 

 hibernating habitat for bats (Tuttle and Stevenson, 1978) . Based 

 upon the large number of bats captured, it is apparent that the 

 caves are used extensively during the summer. However, the cool 

 temperatures probably preclude the use of the cave by female bats 

 (Kunz, 1982, Anthony, et al. 1981). Of the 183 bats captured at 

 Little Ice Cave and Mystery Cave, only 22 were females and none 



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