Naskrecki & Guyton / Parasitic fly (Raymondia sp.) on fur of Horseshoe bat (Rhinolophus mossambicus) from Gorongosa National Park, Mozambique

Naskrecki & Guyton / Parasitic fly (Raymondia sp.) on the wing membrane of the Horseshoe bat (Rhinolophus mossambicus) from Gorongosa National Park, Mozambique

Naskrecki & Guyton / Bat louse fly (Penicillidia sp.) from Gorongosa National Park, Mozambique

Nick Upton / Swift lousefly (Craeterina pallida), a blood sucking parasite unique to swift nests, found on a Swift chick (Apus apus) and held in the hands of a bird ringer, Worlington, Suffolk, UK, July. Model rel...

Doug Wechsler / Brown lacewing (Hemerobiidae) larva feeding on Oleander Aphid (Aphis nerii) Philadelphia, USA, June.

Doug Wechsler / Chamaemyiid (Chamaemyiidae) fly larva predator on Mealy plum aphid (Hyalopterus pruni) Philadelphia, Pennsylvania, USA French Creek State Park

Melvin Grey / Double-crested cormorant (Phalocrocorax auritus) with louse fly. Everglades National Park. Florida, USA. February.

MYN / Gil Wizen / Louse fly (Hippobosca camelina), Carmel Mountain Range, Israel, April. Focus-stacked. meetyourneighbours.net project

Jussi Murtosaari / Flies (Brachycera) on leaf, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. June

Jussi Murtosaari / Fly (Brachycera) on Lily of the Valley berries, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. September

Jussi Murtosaari / Deer fly (Lipoptena cervi) on human skin, South Karelia, southern Finland, September.

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