A study of the avian prey of the bat revealed that over fifty species of birds are targeted, in a range of sizes but a preference for those weighing less than 35 grams. Birds that roost in flocks make up a large part of the diet, and a quarter of the species are non-passerines. One nocturnal species of bird is recorded at their middens, the Australian owlet-nightjar "Aegotheles cristatus". The examination of the butchered remains of their middens has given support to interpretation of fossil depositions, that have similar assemblages of discarded remains, at the Riversleigh formations where this and other species of "Macroderma" are exceptionally well represented.