Bogan, M. A., P. M. Cryan, T. J. O’Shea, L. E. Ellison, and E. W. Valdez
Bogan, M. A., P. M. Cryan, T. J. O’Shea, L. E. Ellison, and E. W. Valdez. 2003. Western crevice and cavity roosting bats. In: Monitoring trends in bat populations of the U. S. and territories: problems and prospects. Information and Technology Report 2003-0003. U. S. Geological Survey. 69-77 p.
Among the 45-species of bats that occur in the United States (U.S.), 34 species regularly occur in western regions of the country. Many of these “western” species choose roost sites in crevices or cavities. Herein we provide an introduction to the biology of bats that roost in cavities and crevices and assess the challenges and opportunities associated with monitoring their populations. We reviewed recent studies and examined the U.S. Geological Survey Bat Population Database (BPD) for records of western bats using crevice and cavity roosts. We found records of 25 species of western bats that use crevice or cavity roosts for at least part of their annual cycle…