Smithsonian National Museum of Natural History, North American Mammals
Search the Archive

  Chiroptera · Vespertilionidae · Nycticeius humeralis
   Smithsonian Institution
   Copyright Notice
   Privacy Notice
Nycticeius humeralis

Evening Bat

Order: Chiroptera
Family: Vespertilionidae

Image of Nycticeius humeralis
Click to enlarge. (89 kb)

Conservation Status: Least Concern.

Evening bats that roost together seem to share information about the location of rich foraging patches and alternative roosting sites. When they forage on farms, they are a boon to farmers, because the bats eat cucumber beetles (the adult stage in the life of the southern corn rootworm). Evening bats have never been found roosting in caves. Summer maternity colonies have been found in buildings and hollow trees; in the winter, bats of this species have been found roosting in palm fronds in Florida. Females and young appear to migrate fairly long distances; one individual was located 520 km from where it had been caught and tagged. Only females migrate northward in the summer; males apparently remain in warm southern locations year-round.

Sexual Dimorphism:
Females are larger than males.

Range: 83-96 mm

Range: 9-14 g


Rafinesque, C.S., 1818.  Further discoveries in natural history, made during a journey through the Western States, p. 445.  American Monthly Magazine, 3:445-446.


Mammal Species of the World

Mammalian Species, American Society of Mammalogists' species account

Distribution of Nycticeius humeralis

Image of Nycticeius humeralis
Click to enlarge. (121kb)

Skull of Nycticeius humeralis
Click to enlarge. (22kb)