Search CO Bat Matrix > Big free-tailed bat (Nyctinomops macrotis) Threat Matrix
Species Profile
Very little is known about use of roosting and foraging habitat by Nyctinomops macrotis. Navo and Gore (2001) documented this species using several rock crevices in canyon country of southeastern and southwestern CO. In northern Arizona small maternity roosts were found for this species in upper portions of vertical cliffs in rock crevices and foraging occurred over long distances (Corbett et al. 2008). Bogan et al. (1998) located maternity roosts for N. macrotis in northwest New Mexico that ranged in colony size from 6-220 bats and were situated higher on cliff faces than any other species encountered in their study including E. maculatum. Haymond et al. (2002) found a maternity roost in southeastern Utah that contained 800 individuals showing colony size can vary widely and attain large sizes. While potentially large maternity colonies could magnify the impacts from disturbances, access to such roosts should rarely occur due to the highly inaccessible nature of such roosts. Activities such as large scale water impoundment could cause permanent loss of habitat and directly affect local populations. However, this species also utilizes alternate roost sites and may be able to compensate somewhat to such disturbances.
| Scope | Severity | Immediacy |
| Low | Low | High |
| Disturbances | G |
