Stephen Dalton / Swarm of Dance flies (Hilara maura) courtship behaviour over water, UK

Andy Sands / Dance flies (Empis tessellata) mating while female eats gift presented by male, Bedfordshire, England, UK. May

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

Laurent Geslin / Dance fly (Empis livida) pair mating, with the female hanging below the male and feeding on its gift, a domestic fly, UK

Nick Upton / Male Dance Fly (Empis tessellata) resting on a leaf, Wiltshire garden, UK, May.

Nick Upton / Male and female Celery flies (Euleia heraclei) performing zig-zagging courtship dance on a leaf, Wiltshire garden, UK, April.

Laurent Geslin / Dance fly (Empis livida) on Oil seed rape (Brassica napus) crop, Switzerland

Nick Upton / Male Dance Fly (Empis trigramma) with complex genitalia used to provide liquid gift to females during mating, standing on Yellow Rocket (Barbarea vulgaris) flower buds. Wiltshire, UK, April.

Nick Upton / Dance fly (Rhamphomyia sulcata) sun basking on a leaf, Wiltshire, UK, May.

Nick Upton / Dance fly (Empis trigramma) portrait of female standing on a leaf, Wiltshire, UK, May.

Nick Upton / Mating Dance Flies (Empis opaca) hanging from a grass stem, with female feeding on March fly courtship gift provided by male. Wiltshire pastureland, UK, May.