Richard Du Toit / Burchell's Zebra (Equus burchellii) reacting to parasitic Bot Fly (Oestridae) trying to lay eggs on it, KwaZulu-Natal, South Africa

Konrad Wothe / Fly (Gymnosoma rotundatum) Bavaria, Germany. June.

Philippe Clement / Parasite fly / tachinid fly (Tachina fera) feeding on nectar from Hogweed (Heracleum sphondylium) in summer, France. August.

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

Piotr Naskrecki / Wingless Bat Fly (Penicillidia sp) on Lesser Long-fingered Bat (Miniopterus fraterculus), Gorongosa National Park, Mozambique

Piotr Naskrecki / Wingless Bat Fly (Penicillidia sp) on head of Long-winged Bat (Miniopterus mossambicus), Gorongosa National Park, Mozambique

Piotr Naskrecki / Lesser long-fingered bat (Miniopterus fraterculus, Miniopteridae) in flight, with a parasitic wingless fly (Penicillidia sp, *** Bent-winged bat (Miniopterus) in flight, with Bat fly (Penicillidia) in...

Bernard Castelein / Fly (Eriothrix rufomaculata), KLein Schietveld, Brasschaat, Belgium. June

Rod Williams / Ladybird fly (Gymnosoma rotundatum) a rare / localised species Brockley Cemetery, Lewisham, London, England, UK. May.

Jiri Lochman / Snail parasite blowfly (Amenia imperialis) Cape Tribulation, North-eastern Queensland, Australia.

Andy Sands / Tachnid fly (Phasia hemiptera) male, the female lays its eggs directly onto Forest Bugs and Green Shield Bugs where the larvae live as parasites, Hertfordshire, England, August