Specieswatch: rare bat may have been in UK for decades

Nathusius' pipistrelle sightings reported from as far apart as Cornwall and Scotland

An elusive British mammal, the tiny bat Nathusius' pipistrelle (Pipistrellus nathusii), may be more widespread and numerous than previously thought.

Sometimes described as a rare visitor or a new coloniser because of climate change, it may have been here decades but had gone undetected.