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Eastern small-footed myotis
The eastern small-footed bat (''Myotis leibii'') is a species of vesper bat. It can be found in Ontario, Quebec in Canada and in the Eastern United States.〔 It is among the smallest bats in eastern North America and is known for its small feet and black face-mask. Until recently all North American small-footed Myotis were considered to be "''Myotis leibii''". The western population is now considered to be a separate species, ''Myotis ciliolabrum''. The Eastern small footed bat is extremely rare throughout all of its range, and due to white-nose syndrome their numbers are continuing to dwindle. Most occurrences of this species have only been counted within the past decade or two and are not revisited regularly making the assessment of their population very difficult to assess. Many biologists believe the species is stable, having declined little in recent times, but that it is vulnerable, especially in its cave hibernacula.
==Description==
The Eastern small footed bat is between 65 to 95 millimeters in length, has a wingspan of 210 to 250 millimeters, and weighs between 4 to 8 grams.〔 〕 The bat got its name from its abnormally small hind feet, which are only 7 to 8 millimeters long.〔Best, T., and Jennings, J. (1997). U.S. Fish and Wildlife Service Federal register notice of a 90-day finding for Eastern small-footed bat and Northern Long-eared bat. ''U.S. Fish and Wildlife Service'' 547: 1-6〕 The fur on the dorsal side of their body is dark at the roots, and fades to a light brown at the tips, which gives the bats a signature shiny, yellow-brown appearance. The fur on the dorsal side of the body is a dull gray color, which is believed to help camouflage themselves in their hibernacula.〔Chapman, B. (2007). The Land Manager's Guide to Mammals of the South. Durham, NC. ''The Nature Conservancy'' 191:1-559.〕 The defining characteristic of this bat is its face-mask, which is completely black.〔 They also have black ears, wings and interfemoral membrane, (the membrane between the legs and tail).〔 Like all bats, the Eastern small footed Bat has a patagium that connects the body to the forelimbs and tail, allowing the animal to fly. Their head is very flat and short, with a forehead that slops gradually away from the rostrum, a feature that is unique to other individuals in the Myotis species.〔 They have erect ears, which are very broad at the base and a short flat nose. They have a keeled calcar (protruding cartridge on the hind legs to support the interfemoral membrane) as well as a pointed tragus Their tail is between 25-45 millimeters in length and protrudes past their interfemoral membrane, and they have a dental formula of 2/3, 1/1, 3/3, 3/3.〔
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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