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

Laurent Geslin / Race horse (Equus caballus) with face mask to protect it from flies, France

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

Georgette Douwma / Domestic horse making use of another horse's tail as fly whisk. UK.

Kim Taylor / Golden-eyed Horse Fly (Chrysops quadratus), close-up of eyes. UK

Lucas Bustamante / Black caiman (Melanosuchus niger) at water surface with horse flies on its head, Yasuni National Park, Orellana, Ecuador.

Nick Upton / Asturian pony / Asturcon (Equus caballus) with masses of Face flies / Autumn house flies (Musca autumnalis) on its head and around its eyes and nostrils, near Llanes, Asturias, Spain.

Juergen Freund / Close up of a March fly eyes (Tabanidae) Queensland,Australia.

Andy Sands / Twin lobed deer-fly (Chrysops relictus) biting the arm of a man, Surrey, England, UK. June

MYN / Lily Kumpe / March Fly (Scaptia sp) Denmark Shire, Warren Bioregion, Western Australia. Meetyourneighbtous.net project

John Abbott / Deer Fly (Chrysops excitans) female, on white background, Fairbanks North Star Borough, Alaska, USA.

Stephen Dalton / Horse fly (Tabanus sp) male in flight towards cornflower, controlled conditions.