Smithsonian National Museum of Natural History, North American Mammals

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  Chiroptera · Vespertilionidae · Lasiurus cinereus

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Lasiurus cinereus

Hoary Bat

Order: Chiroptera
Family: Vespertilionidae

Click to see adaptations.    sound
  Click to play (0:09, 823 kb)
Credit: New Mexico Bat Call Library, W. L. Gannon
Image of Lasiurus cinereus
Click to enlarge. (83 kb)

Conservation Status: Least Concern.

Hoary bats are found from northern Canada all the way to Guatemala, and also in South America and Hawaii. They are solitary and roost in trees. Their frosted, or hoary, look comes from a tinge of white over their grayish-brown fur. Their flight is distinctively fast and direct and can be used as an identifying trait. Hoary bats eat moths, beetles, grasshoppers, wasps, and dragonflies.

Sexual Dimorphism:
Females are larger than males.

Average: 80.5 mm males; 83.6 mm females
Range: 77-87 mm

Range: 20-35 g


Palisot de Beauvois, A.M.F.J., 1796.  A scientific and descriptive catalogue of Peales museum, p. 18.  S.H. Smith, Philadelphia, 205 pp.


Mammal Species of the World (opens in a new window).

Mammalian Species, American Society of Mammalogists' species account *
* PDF reader available here (opens in a new window).

Distribution of Lasiurus cinereus

Skull of Lasiurus cinereus
Click to enlarge. (19kb)

Image of Lasiurus cinereus
Click to enlarge. (167kb)

Bones and Teeth

Lasiurus cinereus
Lower left cheek teeth, with last premolar to the right. Click to enlarge. (11kb)

Lasiurus cinereus
Upper right cheek teeth, with last premolar to the right. Click to enlarge. (17kb)