With a body length of up to 55mm and a weight from 6 – 10g Daubenton's bats are much smaller than pond bats. But still they also show particular large feet. Ears and wings are dark brown, where as the snout is of incaranadian colour. Daubenton's bats echolocate with calls which sweep from 55-95kHz down to 30kHz. They also hunt close above water bodies, in small circles they fly close to the surface to catch prey with their feet.
In contrary to Pond bats Daubenton's bats roost in trees. Woodpecker holes and other cavities in oak and beech trees are prefentially choosen, but artifical bat boxes and bridges can be also among roost sites. They trave only short distances (<150km) between summer and hibernation roosts. The latter are similar to those used by pond bats.