Lorraine Bennery / Picture-winged fly (Platystoma sp.) mating, Prealpes d'Azur Regional Natural Park, France, May.

SCOTLAND: The Big Picture / Pine marten (Martes martes) reflected in woodland pool, Ardnamurchan, Lochaber, Scotland, UK, June.

SCOTLAND: The Big Picture / Pine marten (Martes martes) plagued by midges, amongst buttercups, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

SCOTLAND: The Big Picture / Pine marten (Martes martes) plagued by midges, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

Andy Sands / Picture winged fly (Myopites inulaedyssentericae) female on fleabane (pulicaria dysenterica) flower. This fly lays eggs on fleabane and the larvae form a gall on the plant, Surrey, England, UK, June.

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

Doug Wechsler / Picture-winged Fly (Tritoxa incurva) on goldenrod, Philadelphia, Pennsylvania, USA, August.

Paul Harcourt Davies / Picture-winged fly (Platystoma seminationis) Podere Montecucco, Orvieot, Umbria, Italy, July

Nick Upton / Picture-winged fly (Seioptera vibrans) displaying by flicking wings open and closed. Wiltshire, UK, June.

Scott Leslie / Picture-winged Fly (Ulidiidae) on a daisy, Nova Scotia, Canada

Doug Wechsler / Signal flies (Pseudotephritis approximata) pair, laying eggs in tree bark, Camp Woods Preserve, Pennsylvania, USA. August.

Doug Wechsler / Signal fly (Pseudotephritis approximata) female, laying eggs in tree bark, Camp Woods Preserve, Pennsylvania, USA. August.

Gil Wizen / Male Hammerhead fly (Plagiocephalus latifrons) close up portrait, males with wider heads have more chance of attracting a mate, Jatun Sacha Biological Station, Napo province, Amazon basin, Ecuador.

Doug Wechsler / Picture-winged fly (Euxesta notata) on dead fish, Philadelphia, Pennsylvania, USA. August.

Doug Wechsler / Peacock fly (Callopistromyia annulipes) feeding, Montgomery County, Pennsylvania, USA. August.

Doug Wechsler / Peacock fly (Callopistromyia annulipes) feeding, Montgomery County, Pennsylvania, USA. August.

Doug Wechsler / Black onion fly (Tritoxa flexa) on leaf, Philadelphia, Pennsylvania, USA. September.

Doug Wechsler / Picture-winged fly (Idana marginata) on bark, Lebanon County, Pennsylvania, USA. June.

Doug Wechsler / Picture-winged fly (Delphinia picta) performing wing display, Philadelphia, Pennsylvania, USA. October.

Doug Wechsler / Picture-winged fly (Idana marginata) getting nutrients from dead Periodical cicada (Magicicada cassinii), Lebanon County, Pennsylvania, USA. June 2021

Rod Williams / Spectacled berry fly (Anomoia purmunda) on Reed blade. Sutcliffe Park Nature Reserve, Eltham, London, England, UK. August.

Andy Sands / Phoenix fly (Dorycera graminum) Britain's largest ulidiid fly an uncommon species of unimproved grasslands, Hertfordshire, England, UK, June - Focus Stacked

Nick Upton / Picture-winged fly / Banded spotwing (Melieria crassipennis) male displaying to females by fanning its wings on a riverbank rush, River Avon, Wiltshire, UK, July.