A recent news article says
The brown long-eared bat, which weighed just nine grams, was found stressed, stuck and "sore" after flying face first into the sticky trap. Source, BBC news November 2018
The two related questions, make it seem very difficult for a bat to 'accidentally' run into anything.
- Can bats echolocation discern what insects they are preying on?
- What effect does a bat's echolocation have on other bats?
Would could have caused this bat to fly face first into fly paper?