This species is principally a tree dwelling kind, with roosts known from old woodpecker holes, hollow and split trees and from bat boxes. The largest recently discovered colony contained over 120 females and young in a sweet chestnut tree felled two years after being damaged by the October 1987 gales. They feed on the larger moths and beetles and are seem to be most frequently recorded in loose groups of up to 50, flying high over the river valleys in the summer and early autumn while fattening up for hibernation.

There is still an enormous amount to learn about the habits and distribution of these understudied and misunderstood animals and everyone is encouraged to help with this task by reporting any found or seen, and to encourage the conservation of known roosting sites.
John Goldsmith.