I still think that bat is (literally) hanging arund somewhere by the house. About 4AM every morning (and at times during the day), I hear this chirping. Not quite a bird chirp, almost like a computerized beeping chirp. Fast and sharp.
Update: apparently it is! As long as it stays outside in the non trafficked area it can stay. https://youtu.be/gXE9UgrOdls
Drive-in Saturday: you're all becoming stronger, faster hunters.