Baby kept beneath wing during day. This is the only Myotis with a conspicuous fringe of hairs on the edge of the membrane between the hind feet. Range extends to Veracuz and Chiapas. Roosts in rock crevices, caves, buildings, and mines. Highly colonial, nursery colonies form.
Adult males live apart from females, but also in colonies.
Fly over water sources in evening, and may use barns and caves as night roosts. Known from Pinnacles National Monment, but not yet observed at Hastings or Santa Lucia Preserve. Fur tawny to dark brown. Emerges while still light, and commonly forage 10-15 feet high over water and in openings in forests. Occurs in oak, conifers and juniper woodlands from 4,000 feet to sea level.