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Western pipistrelle
The western pipistrelle (''Parastrellus hesperus''), also known as the canyon bat, is a species of vesper bat. It is found in Mexico and in the western United States.〔 The species has historically been placed in the genus ''Pipistrellus'', but molecular evidence does not show any close relationship with that genus, and accordingly it was classified into its own genus, ''Parastrellus'', in 2006.〔
==Characteristics==
''Parastrellus hesperus'' is the smallest bat in the United States. It has a wingspan of 190–215 mm〔 and a body length of 62–80 mm. On average, females are slightly larger than males of this species.〔 ''P. hesperus'' ranges in color from white to pale yellow to dark brown. These bats exhibit counter shading, being dark above and lighter colored below. Their faces, ears, feet, and flight membranes are usually very dark, almost black. The pelage is 3–4 mm long and is full and soft. The bases of all the hairs are black with the distal portions fading to lighter shades. The wings of ''P. hesperus'' are hairless except for the lower third of the interfemoral membrane; the toes also have a light sprinkling of fine hairs.〔 The wings are short and broad, giving ''P. hesperus'' a low-aspect wing which allows it to fly at speeds as low as 5 miles per hour
. ''P. hesperus'' has a short, broad head and short ears with a small, club-shaped tragus.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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