Flygande fladdermus vid sommarstuga på ö

Date of Observation
Sighting Details
What did you observe?
Can you give further details on the observation e.g. behavior, habitat etc:

Liten ö i källsjö, sandig jord, Al, Björk vid vattnet

How many bats did you see?
1
How did you identify them
Visually Identified Bat
How did you hear about BatMapper?: -radio -tv -newspaper -online news -social media - other (please give details)
Jag googlade fladdermöss