What was the Viking word for bat?

Viking word for bat, in Old Norse language spoken by Vikings, was leðrblaka, which literally means leather flapper or leather shaker, derived from leðr meaning leather and blaka meaning flapper, referring to bat's leathery wings that flap. Another Old Norse term was kveldsvaka, meaning evening watcher, related to bat's nocturnal activity. Old Norse vocabulary for bats was descriptive based on appearance and behavior. Leðrblaka is attested in Old Norse texts and is ancestor of modern Scandinavian words for bat, such as Swedish fladdermus and Norwegian flaggermus, though modern terms differ. Vikings would have known bats as common nocturnal animals in Scandinavia and would have had folklore about them. So Viking word for bat was leðrblaka, descriptive term emphasizing leather-like wings, which is consistent with other Germanic languages where bat names often reference fluttering or leather.