Leisler's bat, lesser noctule
Leisler's bats were formerly known as hairy-armed bats, due to the long hair around the back and shoulders.
The maximum recorded age is 9 years, but it is likely that they live for longer.
Body length: 4.8-6.8cm, Wingspan: 2.6-3.2cm, Weight: 11-20g.
Leisler's bats have short black-brown fur, which is rufous-coloured on the upper-side and yellow-brown on the underside. The face, ears and wing membranes are black-brown.
Leisler's bats are distributed nearly all over Europe, although they are absent from Scandinavia, Portugal, and rare in Spain and Italy. They are common and widespread in Ireland. They are also found in parts of Asia.
They are primarily woodland bats, but also inhabit parkland and urban areas.
Leisler's bats emerge shortly after sunset and feed on flying insects, such as moths and beetles.
In the summer, they roost in buildings, bat boxes and tree holes, sometimes with noctules. They hibernate in tree holes and buildings from April to September.
The mating season starts at the end of August, where the male has a defended mating roost and a harem of about nine females. The young are born in mid-June and are weaned after 7-8 weeks.
Leisler's bats are listed as Lower Risk by the IUCN.