Remember this? I'm truly grateful the llama didn't make his mound on the windowsill. But the bats don't show the same reticence.
The front of the house and two of the windows are crusted and splatted with flying rodent (are bats rodents?) guano.
The photo shows the upstairs window sill, above which is the bat cave entrance. I hear hundreds of them squeaking and scuttling about in the loft, they then stick their arses out the hole, do a quick poo and then fly off into fly-munching land. Charming habits.
Most nights two or three whirl above my head in the bedroom, and each time you find a picture askew you can bet a bat is snoring behind it. I wonder if the bat splat is any good on the compost heap?