Another bat related post which answers a question

I visited a number of free-tail bat roosts to watch their dusk emergence (it's very dramatic) and when you stand under "the ribbon" and they're low you can feel the "sprinkle" (and with so many bats, some are bound to be needing to relieve themselves).



or



Both videos of Asian wrinkle-lipped bats (Chaerephon plicatus).
When they are overhead you feel it.

Ian