Leisler’s bat

Nyctalus leisleri

  1. Wildlife
  2. Mammals
  3. Leisler’s bat


The Leisler’s bat has golden-tipped or reddish-brown fur which is darker at the base and longer over its shoulders and upper back. They forage on flies, moths, caddis flies and beetles. These bats locate their prey using echolocation and their calls can sometimes be heard by the human ear. They roost in holes in trees as well as in buildings and make use of bat boxes. Listen out for their calls just before they emerge from a roost in the evening. During winter they hibernate mostly in tree holes but occasionally in buildings or underground.

How to identify

Leisler’s bats emerge from roosts at sunset and often fly fast and high near tree tops. Look for them also flying around streetlights, foraging on the insects attracted to the light.

Where to find it

These are rare in the UK but may potentially be found throughout the country.


When to find it

  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October

How can people help

Disturbance of roosts threaten these species. The Wildlife Trusts are working hard to restore our native woodlands and you can help our bats in your own garden, too, by putting up a bat box. Pick a tree that gets some sun during the day, but is near to a hedge or other trees. All UK bats and their roosts are protected by law, which means it is illegal to harm or disturb them.

Species information

Common name
Leisler’s bat
Latin name
Nyctalus leisleri
Length: 50-70mm Wingspan: 260-320mm Weight: 12-20g Average lifespan: up to 9 years
Conservation status
Least concern but all bats are protected in the UK under the Wildlife and Countryside Act, 1981.