Do you have bats ??
We had bats in the cellar and the attics when we moved here nigh on 20 years ago.
In the cellar were several large ones, which hung down from above with their wings wrapped tightly around their bodies.
In the attics we found small ones which clutched the walls and some slightly larger ones which kept them company.
No idea what the big-boys were and they seem to have moved away.
The smaller ones are still with us. Their numbers vary according to the seasons.
Currently we have about a dozen Pipistrelle and Horseshoe Bats lurking behind the large shutters of our bedroom - thus those shutters are never touched and the french-doors stay firmly shut during the night.
There are signs in the attics, but I have not located the bats themselves.
This is the first year we have not found babies in the bathrooms - so they are obviously getting better at caring for their young
I love seeing them swirl overhead in the dusk - eating all those pesky insects and I like the idea that we amicably share our space with these creatures.