Stephen Dalton / Horse fly (Tabanus sp) male taking off from poppy seed-head (Papaver rhoeas) Sussex, UK

Laurent Geslin / Horsefly (Tabanus bovinus) near a domestic cow, Switzerland

Alex Hyde / Horsefly (Philipomyia aprica) Aosta Valley, Monte Rosa Massif, Pennine Alps, Italy. July.

MYN / Paul Harcourt Davies / Horsefly (Tabanus bovinus) close up of male feeding on fennel flower nectar (the females are blood suckers) Lazio, Italy, July. meetyourneighbours.net project

Robert Thompson / Cleg fly (Haematopa pulvialis) adult at rest on bog myrtle, County Antrim, Northern Ireland, UK, July

Luiz Claudio Marigo / Jabiru Stork (Jabiru mycteria) plagued by horseflies (Tabanidae). Pixaim River, The Pantanal wetlands of Mato Grosso State, Brazil, November.

Alex Hyde / Cleg fly / Horsefly (Haematopota pluvialis) sucking blood from human.

Stephen Dalton / Horsefly (Tabanus sp) male feeding on flower nectar, UK

Stephen Dalton / Horsefly (Tabanus sp) male feeding on flower nectar, UK

Stephen Dalton / Horsefly (Tabanus sp) male feeding on flower nectar, UK

Nick Upton / Cleg fly / Horsefly (Haematopa pluvialis) sucking blood from photographer's arm, Wiltshire pastureland, UK, June.

Stephen Dalton / Horsefly (Tabanus sudeticus) feeding on human skin, UK