There's a wingless fly, also known as a 'face huggers' or 'bat flies', that feeds off the blood of bats. Most would think the thing was a tick or a spider but it's a parasitic fly, the Penicillidia type, that is exclusive only to long-winged bats. Bat flies are parasitic insects that are adept at attaching themselves to unwilling bats and feeding on their blood for as long as they want. Commonly, these nasty looking things attach themselves to a bat's face. Curled claws on the ends of each of it's six legs anchors the bat fly to the bat's fur making it impossible for the hapless bat to get it off. The parasite rarely leaves it's comfy host, a nice warm bat, and if it needs to (ie: a female leaving to lay her larvae) then it returns to the same bat very quickly and clamps back on. Larvae are planted within the bat cave or just on the outer ridges of the main cave opening. Smart little things... Penicillidia Flies 1. 2. No need to scratch...you don't have one in your hair...honest... 3. 4.