Abstract. We report the first record of the greater mastiff bat Eumops perotis from Oklahoma. This specimen represents a 1, km range extension from the. Geographic distribution of the greater mastiff bat. Eumops perotis is unusual in that there are two widely disjunct regions of occurrence. The northern portion. Information about the Western Mastiff Bat (Eumops perotis), a species found in the State of Texas.

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Wikimedia Commons has media related to Eumops perotis. A large free-tailed bat, similar to Tadarida and Nyctinomops in general appearance but nearly twice as large; foot large, ratio of foot to tibia about 60; ears large, united across the forehead and projecting about 10 mm beyond the snout; second joint of fourth finger about 6 mm; pelage short and velvety; upperparts brown or grayish brown, bases of hairs whitish; underparts paler.

Vegetation is dominated by stands of dense, spiny shrubs with tough hard or waxy evergreen leaves. In other words, Central and South America. Mating occurs in early spring when the dermal gland of adult males is most functional and the testes enlarge and descend. Generally, this bat is found in a eumpos of habitats, from dry desert washes, flood plains, chaparral, oak pertis, open ponderosa pine forest, grassland, montane meadows, and agricultural areas. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts.

By using this site, you agree to the Terms of Use and Privacy Policy. Away fumops human habitations, this bat generally seeks diurnal refuge in crevices in rocks that form vertical or nearly vertical cliffs.

More information is needed on perotiw of breeding colonies, seasonal movements, roosting and foraging requirements. Roosts are perotiw high above the ground, usually allowing a clear vertical drop of at least 9.

Captive bats are unable to take off from the ground or from flat surfaces, and also are unable to maintain flight after launching themselves from the tops of tables.

Western Mastiff Bat Eumops perotis Protection Status Notes Since western mastiff bats produce piercingly loud calls that can easily be heard, experts can use these to assess status euomps.

Eukops to the family Molossidae, its wings are distinctively long but rather narrow. Both sexes of the western mastiff bat possess a peculiar dermal gland on the throat which looks like a pouch and produces an odoriferous secretion, athough this gland is much more developed in the males Ahlborn, ; Texas Tech, ; Allen, At this site the canyon wall is about 38 m high and the rather steep slope below the cliff has no tall vegetation that might obstruct the takeoff and landing of the bat.


These include coastal and desert scrublands, annual and perennial grasslands, conifer and deciduous woodlands, as well as palm oases Ahlborn, ; Cockrum, ; Allen, Western mastiff bat Conservation status. Other More surveys are needed, using acoustic techniques, to delineate the range of this species.

Western Bonneted Bat (Eumops perotis) ยท

Description Eumops perotis can be distinguished from all other North American molossid free-tail species based on size. The fungus grows pertois, 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.

Glossary Nearctic living in the Nearctic biogeographic province, the northern part of the New World. It is the largest molossid in North America.

A field guide to the mammals. Unlike vespertilionids which mate in the fall, North American molossids, including E.

Eumops perotis is an insectivore feeding primarily on flying eimops. Prey includes relatively small, low-flying, and weak-flying insects. Deserts can be cold or warm and daily temperates typically fluctuate. Methods need to be developed for assessment and on-going monitoring of population size.

IUCN Red List of Threatened Species

Biogeographic Regions nearctic native neotropical native Habitat Suitable habitat for the western mastiff bat consists of extensive open areas with potential roost locations having vertical faces to drop off from and take flight, such as crevices in rock outcropings and cliff faces, tunnels and tall buildings. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends.

Its pelage is short, velvety, and whitish at the roots. Eumops perotis exhibits yearlong nocturnal activity and generally goes into daily torpor from December through February, maintaining foraging activity at night except when temperatures drop below 5 degrees C.

Western mastiff bat

Habitat Regions terrestrial Terrestrial Biomes desert or dune chaparral forest scrub forest Other Habitat Features urban suburban Range elevation 5 to m Normally only one young is produced per pregnancy, but occasionally a female may give birth to twins.

This is unusual as most bat species produce calls in a kHz range far above that of which is audible to humans.


Western mastiff bats seeks out roosts below which there is an unobstructed drop of several meters allowing for sufficient momentum to become airborne to be achieved when they take off. Retrieved from ” https: Ongoing Recovery Loss of large open-water drinking sites seems to pose a serious threat to mastiff bats in the Southwest. Most authors agree that the bats choose a roost below which there is an unobstructed drop of several meters so that the emerging bats can drop and gain sufficient momentum to become airborne.

Males and females of this species pperotis together throughout the year, including the period when young are produced.

The ADW Team gratefully acknowledges their support. The northern limit of its range is the southern half of California. Their colonies are small, usually numbering fewer than members, and adult males can be found in maternity colonies Cockrum, ; Texas Tech, ; Ahlborn, Roost entrances are typically horizontally oriented with moderately large openings and face downward so that they can be entered from below.

There are openings on both the lower and upper edges of the slab. The range of this subspecies is principally southwest desert regions of the United States, along the border with Mexico; however, the range extends as far north on the Pacific coast to Alameda CountyCalifornia.

It is interesting to note that flightless insects, including ants and crickets, comprise part of their diet even though these bats are unable to take off from the ground, requiring that the prey be snatched up as the bat flies by.

These bats leave their day roosts late in the evening to forage.

Suitable habitat for the western mastiff bat consists of extensive perotks areas with potential roost locations having vertical eeumops to drop off from and take flight, such as crevices in rock outcropings and cliff faces, tunnels and tall buildings. Coloration is dark to greyish brown dorsally and more pale ventrally. The offspring are dull black in color at birth and are naked, except for tactile hairs on the feet and face. To cite this page: