Andy Sands / Robberfly (Machimus cingulatus) head close up showing large compound eyes. Captive, UK, July.

Wild Wonders of Europe / Ziegler / Robber flies (Asilidae) mating, one with insect prey, The Peloponnese, Greece, May 2009

Wild Wonders of Europe / Smit / Robber fly (Asilidae) with mosquito prey hanging from leaf, Gornje Podunavlje Special Nature Reserve, Serbia, June 2009

Bernard Castelein / Robber fly (Eutolmus rufibarbis) De Inslag, Brasschaat, Belgium July

Paul Harcourt Davies / Red-legged robberfly (Engelepogon brunnipes) with Damselfly (Zygoptera) prey, Sardinia, Italy, September

Paul Harcourt Davies / Red-legged robberfly (Engelepogon brunnipes) with Damselfly (Zygoptera) prey, Sardinia, Italy, September

Nick Upton / Robber Fly (Saropogon sp.) on seedhead. Karlovasi, Samos, Greece, July.

Nick Upton / Robber Fly (Saropogon sp.) on seedhead. Karlovasi, Samos, Greece, July.

Nick Upton / Slender-footed robberfly (Leptarthrus brevirostris) standing on Yellow rattle flower (Rhinanthus minor), chalk grassland meadow, Wiltshire, UK, June.

Nick Upton / Violet black-legged robber fly (Dioctria atricapilla) with a hoverfly as prey, chalk grassland meadow, Wiltshire, UK, June.

Nick Upton / Violet black-legged robber fly (Dioctria atricapilla) with Dashed slender robber fly (Leptogaster guttiventris) prey, chalk grassland meadow, Wiltshire, UK, June.

Wild Wonders of Europe / Muñoz / Robberfly (Asilidae) with damselfly prey, Campanarios de Azaba Biological Reserve, a rewilding Europe Area, Salamanc, Castilla y Leon, Spain