. The Canadian field-naturalist. Natural history; Sciences naturelles. 2005 Notes 133. Figure 1. Underside of wooden bridge spanning Shane Creek, Stillwater County, Montana, showing July 2003 day- roost locations of a female Hoary Bat (A) and a mater- nity colony of Big Brown Bats (B). visits to specific structures (Davis and Cockrum 1963; Keeley and Tuttle 1999; Adam and Hayes 2000; this study), or else monitor activity more intensively at a small number of structures (Davis and Cockrum 1963; Pierson et al. 1996; Adam and Hayes 2000); the num- ber of bridge visits or scope of intensive survey
. The Canadian field-naturalist. Natural history; Sciences naturelles. 2005 Notes 133. Figure 1. Underside of wooden bridge spanning Shane Creek, Stillwater County, Montana, showing July 2003 day- roost locations of a female Hoary Bat (A) and a mater- nity colony of Big Brown Bats (B). visits to specific structures (Davis and Cockrum 1963; Keeley and Tuttle 1999; Adam and Hayes 2000; this study), or else monitor activity more intensively at a small number of structures (Davis and Cockrum 1963; Pierson et al. 1996; Adam and Hayes 2000); the num- ber of bridge visits or scope of intensive surveys may be inadequate to detect an extremely low frequency of bridge use by the Hoary Bat. Studies that focus on bridges known to be used as night roosts (Pierson et al. 1996; Adams and Hayes 2000) may overlook Hoary Bats if their use of bridges is more likely during the day, the time when we made our observation. Thus, low roost site fidelity and a solitary nature may make detecting the rare occupancy of bridges by Hoary Bats even more problematic if only single visits to bridges are made during daytime surveys, or studies are focused primarily or exclusively on night roost dynamics. Acknowledgments Our observations were made during a cost reim- bursement contract (MDT Project #8159) between the Montana Department of Transportation and Montana State Library-Natural Resource Information System/ Montana Natural Heritage Program. The opinions, find- ings, and conclusions expressed in this publication are those of the authors and not necessarily those of the Montana Department of Transportation or the Feder- al Highway Administration. We thank Susan Sillick (MDT) and Jim Hill (NRIS) for administering this contract, and Larry Urban (MDT) for being receptive to the initial idea. Laura Ellison (US Geological Survey) identified the source of their bridge use record. Our paper benefited from the comments of two reviewers. Literature Cited Adam, M. D., and J. P. Hayes. 2000. Use of bridge
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