Nyctinomops femorosaccus (Pocketed Free-tailed Bat)
Pocketed Free-Tailed Bat description
See Kumirai and Jones (1990) for a key to the species of NYCTINOMOPS.
Pocketed Free-Tailed Bat habitats
Habitat and Ecology
This species inhabits semiarid desertlands. Their roosts can be found in caves, tunnels, mines, and rock crevices. They have also been found hanging under the roof tiles of buildings. They are usually found in large colonies. (Vaughn, Ryan, Czaplewski, 1999)
Terrestrial Biomes: desert or dune ; chaparral
Comments: Usually associated with rugged canyons, high cliffs, and rock outcroppings. Roosts in rock crevices and caves during the day; may also roost in buildings or under roof tiles. Has been taken in desert shrubland, over waterhole surrounded by mixed tropical deciduous and thorn forest (Sonora, Mexico), in floodplains with much sycamore and mesquite, in areas adjacent to high cliffs, and in pine-oak forest at 2160 m (Feb. in Jalisco) (Kumirai and Jones 1990). Winter habits poorly known.
Pocketed Free-Tailed Bat size
Length: 10 cm
Weight: 15 grams
Sexual Dimorphism: None
Average: 109 mm
Range: 99-118 mm
Range: 13.8-17 g
Pocketed Free-Tailed Bat distributions
This species occurs from Guerrero (Mexico) to New Mexico, Arizona, California (USA) and Baja California (Mexico; Simmons 2005). It occurs from lowlands to 2,250 m asl (Wilson and Ruff 1999).
Nyctinomops femorosacca, the Pocketed Free-tailed Bat, is a member of the Molossidae. It inhabits the southwestern United States and northwestern Mexico. The bat has been seen in southern Arizona, southern California, southeastern New Mexico, western Texas, and into Mexico to the state of Michoacan. ( http://www.nsrl.ttu.edu/tmot/nyctfemo.htm )
Biogeographic Regions: nearctic (Native )
occurs (regularly, as a native taxon) in multiple nations
Pocketed Free-Tailed Bat Conservation Status
Red List Category
Red List Criteria
- Least Concern (LC)
- 1996Lower Risk/least concern (LR/lc)
The status of the Pocketed Free-tailed Bat is not known. They are undoubtedly being threatened by the habitat modification and pesticide dispersal by humans. (Grzimek, 1990) There are no conservation projects underway specifically for Nyctinomops femorosacca.
Temperate North American bats are now threatened by a fungal disease called “white-nose syndrome.” This disease has devastated eastern North American bat populations at hibernation sites since 2007. The fungus, Geomyces destructans, grows best in cold, humid conditions that are typical of many bat hibernacula. The fungus grows on, and in some cases invades, the bodies of hibernating bats and seems to result in disturbance from hibernation, causing a debilitating loss of important metabolic resources and mass deaths. Mortality rates at some hibernation sites have been as high as 90%. While there are currently no reports of Nyctinomops femorosaccus mortalities as a result of white-nose syndrome, the disease continues to expand its range in North America.
US Federal List: no special status
CITES: no special status
IUCN Red List of Threatened Species: least concern
Rounded National Status Rank: N3 - Vulnerable