Bats and Birds mostly come to death if they fall in open vessels such as watering cans, rain barrels, empty flowerpots, buckets which are on the open balcony or in the garden. Fly glue traps also could not just be a trap for insects, but they can be dangerous for bats, too. Tip: Be careful with open vessels outside, please, cover them. Please, abstain from the use of fly glue traps especially in parts of the building where bats (attic, barn, etc.) could stay.