A bat ranging from Europe through Siberia to the Pacific coast, known for its frosted, two-coloured fur.
Its long fur has dark brown bases and silvery-white tips. The snout and wing membranes are dark, and the ears are short and broad.
In summer it roosts in crevices in buildings and trees and catches small insects while flying over open spaces. In winter it often uses crevices in buildings.
An extinction-risk assessment has not been added yet.