This survey in Sherwood was undertaken in the snow, but that wasn’t a problem here as I was commissioned to have a close look at two features of a building (Sherwood Library). Another ecologist had looked at this building with some other structures in a wider site survey and had recommended evening surveys for bat roosts. These evening surveys can’t be undertaken in winter (as bats are hibernating), so the client was facing a delay.
I was asked to attend and endoscope the two features on the building that bats could roost in. I was able to rule one of them out, but unfortunately an expansion gap between the building and lift shaft lead into a large cavity. If bats were in there, I wouldn’t have been able to confidently find them with my scope.