Paul Hobson / Noctule bat (Nyctalus noctula) on moss covered branch, captive, UK

Paul Hobson / Noctule bat (Nyctalus noctula) on moss covered branch, captive, UK

Dietmar Nill / Leisler's / Lesser noctule bat (Nyctalus leisleri) roosting on tree trunk, Germany

Dietmar Nill / Leisler's / Lesser noctule bat (Nyctalus leisleri) two bats at nest hole in tree, Germany

Dietmar Nill / Leisler's / Lesser noctule bat (Nyctalus leisleri) emerging from hole in tree trunk, Germany

Dietmar Nill / Leisler's / Lesser noctule bat (Nyctalus leisleri) emerging from hole in tree with another on tree trunk, Germany

Dietmar Nill / Leisler's / Lesser noctule bat (Nyctalus leisleri) roosting on tree, Germany

Bruno D'Amicis / Biologist collecting saliva from a Noctule bat (Nyctalus noctula) for a DNA sample. Berlin, Germany

Bruno D'Amicis / Noctule bat (Nyctalus noctula) handled by a biologist. Berlin, Germany

Klaus Echle / Noctule bat {Nyctalus noctula} males flying from Black woodpecker nest hole in tree, Germany

Dietmar Nill / Group of Noctule bats being fed grubs with help of tweezers {Nyctalus noctula} captive

Dietmar Nill / Noctule bats roosting {Nyctalus noctula} Germany