Jm. Russ et al., The status of Nathusius' pipistrelle (Pipistrellus nathusii Keyserling & Blasius, 1839) in the British Isles, J ZOOL, 254, 2001, pp. 91-100
There are now 91 records of individual Nathusius' pipistrelle Pipistrellus
nathusii examined 'in the hand' in the U.K., and bat detector records from
a further 36 localities in Britain and Ireland. These records are distribut
ed throughout all months of the year with clear peaks in spring and autumn
suggesting migratory movements into and out of the British Isles in autumn
and spring, respectively. Three maternity colonies have been located and th
e species must now also be regarded as a resident breeding species in Brita
in and Ireland.