There is not much known about the behaviour of parti-coloured bats, as they are quite rare.

The parti-coloured bat or rearmouse (Vespertilio murinus) is a species of vesper bat.

The parti-coloured bat occurs in Central and Western Europe and in Asia.

Parti-coloured bat (Vespertilio murinus)

They are, as a genus, unusual, being the only bats apart from the parti-coloured bat Vespertilio murinus to possess an extra pair of nipples (four in total).

Inventories during the 1990s have documented a presence of Northern Bat, Parti-coloured Bat, Daubenton's Bat, Noctule, Soprano Pipistrelle, Brown Long-eared Bat, Whiskered Bat.

Unfortunately, Dr Rydell can't yet test this idea as he doesn't know where his bats roost in the spring and autumn, but his case is supported by the behaviour of another insectivorous bat, the parti-coloured bat, in Denmark.

The parti-coloured bat or rearmouse (Vespertilio murinus) is a species of vesper bat.

The parti-coloured bat or rearmouse (Vespertilio murinus) is a species of vesper bat.

P. murinum - the bat (Vespertilio murinus)

Particoloured bat (Vespertilio murinus)

They are, as a genus, unusual, being the only bats apart from the parti-coloured bat Vespertilio murinus to possess an extra pair of nipples (four in total).