Date of Observation
Roost Details
Give specific details on the location e.g. is it in the attic, under roof tiles, inside the building, in a tree hole, underneath bark of a tree:

There are at least 34 bats living in our attic. We have heard them for some time now and seen some occasionally, but it was today that we understood that they live under our roof. 34 of them flew out but we understand that there are more of them since we could still hear them squeaking. 

Where is the Roost
House / Cabin
How long has it been used by Bats
Only This Year
How do you know it's a Bat Roost
Heard (without Detector)
Other (How do you know it's a Bat Roost)
And seen 34 of them flying out from the attic.
How many Bats use this Roost approximately
Do you know what Species use the Roost

No. From what we could see they have a light colored with a black line across their faces. The other edges of the wings are are black. Just from looking at pictures we guess it can be dvärgfladdermus. 

How did you identify them
Visually Identified Bat
Do you have sound files of recorded Bats
How did you hear about BatMapper?: -radio -tv -newspaper -online news -social media - other (please give details)