Nycticieus humeralis - evening bat
The evening bat is a small brown bat that ranges east of the Appalachians, from southern Pennsylvania to Florida. West of the mountains, it occurs from extreme southern Michigan and Wisconsin, west to southeastern Nebraska and south through eastern and southern Texas. It is abundant in southern coastal states. Nursery colonies in buildings can contain hundreds of individuals. Smaller colonies are found beneath loose tree bark and in tree cavities. These bats are also known to use bat houses. Although winter habitat is unknown in most of their range, they have been found overwintering in bat houses in Florida and in buildings in northern Texas.
Pipistrellus hesperus - western pipistrelle
The western pipistrelle is a small small light gray or yellowish tan bat with a distinctive black mask that includes its face and ears. It lives primarily in arid and semiarid lowland areas from Washington and Oregon, south through southwestern Idaho and western Nevada to Michoacan and Hidalgo Mexico. It also ranges east through much of Utah, extreme southwestern Colorado, most of New Mexico to southwestern Oklahoma, and southward across West Texas. They generally roost in cliff face crevices, but have also been found roosting beneath rocks, in dead leaves of palms, and behind window shutters.
Pipistrellus subflavus - eastern pipistrelle
The eastern pipistrelle is a small bat with tricolored fur that is dark at the base and tips and lighter in the center. The bat can easily be identified when roosting by the juxtaposition of reddish-orange forearms and black wing membranes. It ranges from eastern Canada throughout most of the eastern U.S. They are generally solitary bats although females form small maternity colonies of 35 individuals or less in tree cavities, rock crevices, and sometimes buildings.
Eumops perotis - western mastiff bat
The western mastiff bat is a large brownish grey to dark gray bat with a paler underside, long, narrow wings and a tail that protrudes beyond the tail membrane. The rounded ears are joined at the midline and extend beyond the nose. It ranges from California to Texas. Western mastiff bats roost in cliff faces and buildings. They form colonies of less than 100 individuals. They are probably non-migratory, but may move among several roosts in an area.
Eumops glaucinus - Wagner’s mastiff bat
Wagner’s mastiff bat is a large dark grey or brown bat with a paler underside. It has long narrow wings, smooth lips, and a tail that protrudes beyond the tail membrane. The round ears are joined above the forehead. In the U.S., it is found only in southern Florida. Western mastiff bats roost in tree hollows, palm fronds, and buildings, particularly under Spanish tile roofs. This species is uncommon although they a nursery colony of 32 individuals has been reported. They are permanent residents throughout their range where conditions are warm enough that they do not require hibernation.
Molossus molossus - Pallas’ mastiff bat
Pallas’ mastiff is a medium sized bat with reddish-brown to black fur and a tail that protrudes free from the tail membrane. Although similar in appearance to the Mexican free-tailed bat, Pallas’ mastiff bat has ears that lay forward and are joined at the base. Three colonies of M. molossus have been documented in the U.S. The colonies were found roosting in buildings in the Florida Keys. In other parts of their range, Pallas’ mastiff bats are known to roost in hollow trees, palm fronds, rock crevices, caves, bridges, buildings and bat houses. Young are reared in buildings, hollow trees, or caves.
Nyctinomops macrotis - big free-tailed bat
The big free-tailed bat is light reddish-brown to chocolate brown or black, with narrow wings and verticle wrinkles on the upper lip. It ranges from southern California, Nevada, Utah, and Colorado to southwestern Kansas and northwestern Oklahoma, and the Big Bend area of Texas. Big free-tailed bats roost mainly in crevices and fissures of rocky cliffs, but have also been found in large cave entrances, hollow trees, and buildings. Nursery colonies range from 20 to 150 individuals. There are winter records only from southern Arizona, California, and Texas.
Tadarida brasiliensis - Mexican free-tailed bat
The Mexican free-tailed bat is a medium-sized bat with brown or gray fur, long, narrow wings and a tail that protrudes free from the tail membrane. The ears are large and rounded, and the upper lips have numerous vertical wrinkles. It is common in southern and southwestern U.S. and north to Nebraska, Colorado, Utah, Nevada, and Oregon. Mexican free-tailed bats may form nursery colonies that include anywhere from a few hundred to several million bats. Nursery colonies are found in caves, under bridges, and in buildings. Males form smaller bachelor colonies. These bats also use bat houses. They are not capable of true hibernation and most western populations migrate to caves in Mexico and Central America during the winter, although some colonies overwinter in buildings or bat houses in warmer sections of their range.
Link:
http://www.batcon.org/home/index.asp...1&idSubPage=45
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