Piotr Naskrecki / Vampire Bat (Desmodus rotundus) with parasitic Louse Flies (Trichobius parasiticus) behind its ear, Sipaliwini, Surinam

Piotr Naskrecki / Wingless Bat Fly (Nycteribiidae) parasite on bat wing membrane, Papua New Guinea

Christian Ziegler / Bat Fly (Streblidae) ecto parasite on the wing of Great Fruit-eating Bat (Artibeus lituratus), Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Dietmar Nill / Bat fly {Penicillidia conspicua} amongst bat fur

Piotr Naskrecki / Wingless Bat Fly (Nycteribiidae) on wing membrane of Fruit Bat, Guinea, West Africa