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

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...

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.

David Maitland / Pigeon louse fly (Ornithomya avicularia) amongst the feathers of a Tawny Owl (Strix aluco). Feltwell, Norfolk, UK.

Bruce Thomson / Eastern bentwing / Eastern long fingered bat (Miniopterus orianae oceanensis) hibernating cluster in cave, one bat with bat fly (Hippoboscoidea) Girraween National Park, Queensland, Australia.

Bruce Thomson / Eastern bentwing / Eastern long fingered bat (Miniopterus orianae oceanensis) hibernating cluster in cave, one bat with batfly (Hippoboscoidea) Girraween National Park, Queensland, Australia.

Bruce Thomson / Common vampire bat (Desmodus rotundus) family group infested with ectoparasitic batflies (Hippoboscoidea) roosting in cave aven / vertical shaft, Yucatan Peninsula Mexico

Alex Hyde / Swift Louse Fly (Crataerina pallida) an obligate haematophagous parasite of the Common Swift (Apus apus). Note the atrophied vestigial wings. Photographed on a white background. Devon, UK. July.