Fig. 1

Barbastella barbastellus with visible characteristic ears fused above the forehead (a) and in the top view (b), an example habitat—dead spruces due to the bark beetle outbreak in the Białowieża Forest (Poland) with protruding bark (c) and close up at roost under bark (d). The photos were taken by: Olga Łuczak (a, b) and Andrew Carr (c, d).