Researchers studied fungal colonies living on the skin of Greater mouse-eared bats in autumn, discovering 39 different fungal species. Wing membranes had more fungal diversity than tail membranes, with males carrying more fungi than females. Interestingly, older male bats accumulated more fungal species, while older female bats showed less fungal diversity. The study found no trace of the fungus that causes white-nose syndrome, suggesting caves rather than bats may be the main source of this disease.