Hoary bat

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Hoary bat
Hoary bat Lasiurus cinereus (cropped).jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Chiroptera
Family: Vespertilionidae
Genus: Aeorestes
A. cinereus
Binomial name
Aeorestes cinereus
(Beauvois, 1796)
Distribution of Lasiurus cinereus.png
Distribution of the hoary bat (2008)

The hoary bat (Aeorestes cinereus) is a species of bat in the vesper bat family, Vespertilionidae. It lives throughout most of North America and much of South America, with disjunct populations in the Galápagos Islands and Hawaii.


Juvenile male hoary bat on a tree, frosted "hoary" dorsal coloration visible

The hoary bat averages 13 to 14.5 cm (5.1 to 5.7 in) long with a 40 cm (15.5 in) wingspan and a weight of 26 g (0.92 oz). It is the largest bat normally found in Canada. Its coat is dense and dark brown, with white tips to the hairs that give the species its 'hoary' appearance for which it is named.[2] The body is covered in fur except for the undersides of the wings. Males and females are dimorphic in body mass, with females 40% heavier than males.[3]


The bat normally roosts alone on trees, hidden in the foliage, but on occasion has been seen in caves with other bats. It prefers woodland, mainly coniferous forests, but hunts over open areas or lakes. It hunts alone and its main food source is moths. The bats can cover an impressive 39 km (24 mi) while foraging.[2] Hoary bats are long-distance migrants, spending the winter in Central America and the southwestern United States and the spring and summer in more northern latitudes in the United States and Canada.[4]


The reproductive cycle of the hoary bat is not yet fully documented, but it is thought that they mate in August with birth occurring in June of the following year. It is thought that the gestation period is only 40 days and that mammalian embryonic diapause (delayed implantation) may play a role. The female bears a single pup, or sometimes twins. The young spend about a month with the mother before dispersing.


While not listed as threatened or endangered, hoary bats suffer significant mortality from wind turbines. Across the United States in 2005, 40% of all bats killed by wind turbines were hoary bats—over 1000 hoary bats were killed in 2005.[5] Most bat deaths occur during migration in the spring and fall.[6]


See also[edit]


  1. ^ "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. Retrieved 28 October 2018.
  2. ^ a b "Hoary bat videos, photos and facts - Lasiurus cinereus". ARKive. Archived from the original on 5 May 2016. Retrieved 22 May 2016.
  3. ^ Shump Jr., K. A. and A. U. Shump. 1982b. Lasiurus cinereus. Mammalian Species 185:1–5
  4. ^ Cryan, P. M., & Wolf, B. O. (2003). Sex differences in the thermoregulation and evaporative water loss of a heterothermic bat, Lasiurus cinereus, during its spring migration. Journal of Experimental Biology, 206(19), 3381-3390.
  5. ^ Kunz, T. H., Arnett, E. B., Erickson, W. P., Hoar, A. R., Johnson, G. D., Larkin, R. P., ... & Tuttle, M. D. (2007). Ecological impacts of wind energy development on bats: questions, research needs, and hypotheses. Frontiers in Ecology and the Environment, 5(6), 315-324.
  6. ^ Baerwald, E. F., Patterson, W. P., & Barclay, R. M. R. (2014). Origins and migratory patterns of bats killed by wind turbines in southern Alberta: evidence from stable isotopes. Ecosphere, 5(9), 1-17.

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