Myotis brandtii - Brandt's Bat

Taxonomy

Phylum: Chordata

Class: Mammalis

Order: Chiroptera

Family: Vespertilionidae

Brandt's Bats are small with pointed faces well covered in dark hair. Typically, they have a head-and-body length of 38 to 50mm and weight between 5 and 9gm - marginally larger on average than the closely related whiskered bat. Brandt's bats are found throughout Wales and are reasonably plentiful.

Distinguishing Brandt's Bat from its relative the Whiskered Bat can be difficult - so much so that until 1970 they were not recognised as separate species..

Habitat and flight

You will see Brandt's Bat on the rivers and lakes of Wales, where they feed on moths and other flying insects. These smallish bats emerge at dusk. Often they can be seen seeking insect prey along rivers in West Wales.

Roosts

Brandt's Bats are known to roost in buildings and in trees during in the summer months. They seem fond of crevices, and are sometimes found roosting in cavity walls and behind vertically hanging tiles. They have also been known to make use of bat boxes. Maternity colonies usually number between 20 and 60 bats.

Small groups of Brandt's Bats retreat to underground roosting sites for the winter. They roost mainly in crevices, often in close proximity to other species such as pipistrelles.