The pale townsend's big-eared bat also exhibits a high degree of site attachment, returning year after year to the same maternity roosts. The breeding season extends from October to February, just before or during hibernation. A single young is born in late June or July. The pale townsend's big-eared bat has two large lumps on its snout and its wings and the tail membrane are hairless. As with other Plecotus species, their habit of hanging fairly exposed in both their hibernacula and maternal colonies makes them vulnerable to disturbance and leading to abandonment and increased mortality.
Local extinctions can result in areas with limited roost habitat or excessive disturbance.
Pesticides and other environmental contaminants destroy the prey base. Bats are also known for loading of pesticides in their fat reserves. Notify a natural resources agency of any suspected pale townsend's big-eared bat sightings. Mammals of the Northern Great Plains by J. Knox Jones, Jr. et.