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.
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Update: apparently it is! As long as it stays outside in the non trafficked area it can stay. https://youtu.be/gXE9UgrOdls
