Little Brown Myotis
Myotis lucifugus


  • Evenly colored glossy fur on back and paler underneath.
  • The wingspan is 222-269 mm.
  • Colors may be pale tan, reddish brown, olive brown, dark yellowish brown or dark brown.
  • Long hairs on toes extend beyond the tips of their claws.
  • Skull has 38 teeth


Caves, hollow trees, buildings, or mine tunnels serve as roosting places.


They leave their daytime retreat at dusk and return to the roosting site just before dawn. Colonial. They feed on insects on the wing near the water or forests with an erratic flight. In the North, most migrate South in the fall and go into hibernation in a cave or other suitable retreat. Although they become torpid, they do not go into a deep sleep. They may breed during late fall and winter, but embryonic development does not begin until February in the North.

A Field Guide to the Mammals Peterson Field Guide William H. Burt/Richard P. Grossenheider 3rd Edition Houghton Mifflin Co. 1980