Paul Bertner / Signal Fly (Bromophila caffra), Udzungwa Mountains National Park, Tanzania

Paul Bertner / Signal Fly (Bromophila caffra), Udzungwa Mountains National Park, Tanzania

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

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

Premaphotos / Fly (Bromophila caffra) in tropical dry forest, Kenya

Piotr Naskrecki / Signal Fly (Bromophila caffra), Gorongosa National Park, Mozambique

Premaphotos / Fly (Peltacanthina fumipennis) in rainforest, showing its spongy proboscis, Kenya

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.

Andy Sands / Speckled semaphor fly / Dancing Kiss fly (Platystoma seminationis) an unusual fly that more ofter jumps and runs than flies often associated with rotting vegatation, Hertfordshire, England, UK, May -...