can be found in the form of guano pellets and insect parts, dropped when insectivorous bats take a short break from their nocturnal foraging activities. If you ate half your body weight in insects every night you’d need to take a break and evacuate your bowels, too.
Bat guano is an excellent fertilizer and wars have been fought over this precious resource. Sweep these nuggets of concentrated nitrogen up and toss them in your garden.