Mexican big-eared bat

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Mexican big-eared bat
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Order:
Chiroptera
Family:
Vespertilionidae
Genus:
Corynorhinus
Species:
C. mexicanus
Binomial name
Corynorhinus mexicanus
G.M. Allen, 1916
Synonyms

Plecotus mexicanus

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The Mexican big-eared bat (Corynorhinus mexicanus) is a species of vesper bat. They are nocturnal and insectivorous. Their very large ears are located across their foreheads, and when captured, the bats are observed to curl their ears in a protective manner.[2] The adults are usually brown colored, while the juveniles are usually a smokey brown color. They have small noses.[3]

Habitat and distribution

The Mexican big-eared bat has been identified in Mexico (where they are a native species), Arizona and even as far north as Utah.[2][4] They are found in high, humid, mountain habitats and seem to prefer areas with pine-oak forests,[5] although they have been found around other types of vegetation, such as sycamore, cottonwood and agave.[2] Being a nocturnal species, they rest during the day, their day-time roosts in open caves[2] and mine shafts.[6]

Reproduction

Studies of the males of the species show they have one long reproductive cycle per year. The timing of their cycle is dependent on both physiological (body condition, neurological, and endocrine signals) and environmental (temperature and resource availability) factors. The male reproductive organs are the smallest in February, March, and April, then begin development in May and reach their biggest size, determined by weight, around August (where they are about 40 times bigger than they were in April). The best body conditions of the bats were found from May to June, which suggests this cycle is dependent on body condition.[7]

Status

In 1996, the species was listed as lower risk/least concern, but in 2008, it was moved to near threatened. The population sizes of this bat are declining, and the species may soon be threatened.[1] The major threat to the species is humans, disturbing their roosts and causing habit loss.[8]

See also

References

  1. ↑ 1.0 1.1 Arroyo-Cabrales, J. & Reid, F. 2008. Plecotus mexicanus. 2008 IUCN Red List of Threatened Species.
  2. ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Ceballos, G. and Oliva, G. 2005. Los mamíferos silvestres de México. Comisión Nacional para el Conocimiento y Uso de la Biodiversidad and Fondo de Cultura Económica, México.



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