The Townsend's Big-Eared Bat is a medium-sized bat with extremely long, flexible ears and small yet noticeable lumps on each side of the snout. Its upper parts are similar to dark brown on the back, and wood-brown on the sides. The underparts are a slightly paler shade of brown. These bats can be identified by the nearly uniform color of their bodies.
They eat small moths, flies, lacewings, dung beetles, sawflies, and other small insects.