Date of Observation Mon, 05/01/2000 - 22:00 Roost Details Specific Details on the Location -- Give specific details on the location e.g. is it in the attic, under roof tiles, inside the The bats live in the cold wind next to the chimney. The woodpecker has made holes in the wall and the bats use it to get in and out. Where is the Roost House / Cabin How long has it been used by Bats >10 Years How do you know it's a Bat Roost Seen Bat Roosting How many Bats use this Roost approximately 11-25 Do you know what Species use the Roost No. We save one from our wood boiler and it was a black bat about approximately 10-15 cm wingspan and 10 cm body. I don't know the exactly measurements because we just let it go. How did you identify them Visually Identified Bat Do you have sound files of recorded Bats No How did you hear about BatMapper?: -radio -tv -newspaper -online news -social media - other (please give details) Newspaper. Västerbottens kuriren.