"Phisherman" wrote in message
...

I have a bat house that was erected back in 1992 onto a popular tree,
15 feet up off the ground. No bats have taken
residence, although I see many bats in the summer evenings catching
bugs. There is a nearby pond and stream.

Bat houses are seldom successful when placed in trees. First it's difficult
for the bats to find and make an approach through the leaves and branches
and, as you've found out, it's easily accessible to predators and unwanted
tenants. Bats are very particular about choosing their homes.

Val