Flygande fladdermus vid sommarstuga på ö

Date of Observation
Sighting Details
What did you observe?
Additional question - 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
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Jag googlade fladdermöss