Konrad Wothe / Fly (Gymnosoma rotundatum) Bavaria, Germany. June.

Philippe Clement / Parasite fly / tachinid fly (Tachina fera) feeding on nectar from Hogweed (Heracleum sphondylium) in summer, France. August.

Philippe Clement / Tachina flies (Tachina fera) nectaring on Umbellifer (Apiaceae) flowers in summer, Luxembourg, August.

Bernard Castelein / Fly (Eriothrix rufomaculata), KLein Schietveld, Brasschaat, Belgium. June

Rod Williams / Ladybird fly (Gymnosoma rotundatum) a rare / localised species Brockley Cemetery, Lewisham, London, England, UK. May.

Dave Bevan / Giant tachinid fly (Tachina grossa) nectaring on a sedum flower, Carmarthenshire, Wales, UK

Andy Sands / Tachnid fly (Phasia hemiptera) male, the female lays its eggs directly onto Forest Bugs and Green Shield Bugs where the larvae live as parasites, Hertfordshire, England, August

Andy Sands / Tachnid fly (Phasia hemiptera) male, the female lays its eggs directly onto Forest Bugs and Green Shield Bugs where the larvae live as parasites, Hertfordshire, England, August

Paul Bertner / Tachinid Fly (Tachinidae), Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Paul Bertner / Tachinid Fly (Phorinia sp), Andasibe-Mantadia National Park, Antananarivo, Madagascar

Paul Bertner / Tachinid Fly (Tachinidae), Virunga National Park, Democratic Republic of the Congo

Kim Taylor / Parasite fly (Tachina fera) on Eryngium. Surrey, England, UK, August.

Kim Taylor / Tachinid fly (Dexiosoma caninum). Surrey, England

Nick Upton / Tachinid fly (Nowickia ferox) with worn wings, chalk grassland meadow, Wiltshire, UK, July.

Andy Sands / Tachnid fly (Phyllomya volvulus) Resting on leaf after rain shower, Oxfordshire, England, UK, June

John Abbott / Tachinid or Parasitic fly (Epalpus signifer) flying Travis County, Texas, USA. Controlled conditions. September

John Abbott / Tachinid or parasitic fly (Epalpus signifer) flying Travis County, Texas, USA. Controlled conditions. September

Nick Upton / Parasite fly / Tachinid fly (Zophomyia temula), a nationally scarce species, feeding on Common hogweed (Heracleum sphondylium) on grassland meadow cleared of scrub to improve the habitat for bees and...

Rod Williams / Tachinid Fly (Thelaira nigrina) Hutchinson's Bank, New Addington, London May

Rod Williams / Tachinid fly (Tachina fera) Feeding on ragwort Hutchinson's Bank, New Addington, London September

Rod Williams / Tachinid Fly (Linnaemya picta) Brockley Cemetery, Lewisham, London, UK. August

Rod Williams / Tachinid fly (Nowickia ferox) grooming on wild marjoram, Hutchinson's Bank, New Addington, London August

Rod Williams / Parasitic Fly (Phania funesta) Tachinidae On field bindweed Brockley Cemetery, Lewisham, London, UK. August

Rod Williams / Parasitic fly (Eriothrix rufomaculata) on Tansy (Tanacetum) Brockley, Lewisham, London, UK. July.

Andy Sands / Tachnid fly (Prosena siberita) Berkshire, England, UK, August

Andy Sands / Tachnid fly (Phasia hemiptera) male feeding on flower of wild parsnip (pastinaca sativa), Oxfordshire, England, UK, August

Andy Sands / Tachnid fly (Phasia hemiptera) male feeding on flower of wild parsnip (Pastinaca sativa), Oxfordshire, England, UK, August

Andy Sands / Tachnid fly (Prosena siberita), Berkshire, England, UK, August

Rod Williams / Tachinid fly (Thelaira nigripes) Brockley Cemetery, Lewisham, London, UK August

Stephen Dalton / Fly (Alophora hemiptera) Sussex, UK

Nick Upton / Parasite fly / Tachinid fly (Tachina fera) a parasite of noctuid moths, feeding on Ragwort flowers (Senecio jacobaea) in a woodland clearing, GWT Lower Woods reserve, Gloucestershire, UK, September.

Nick Upton / Parasite fly / Tachinid fly (Gymnocheta viridis), a parasite of lepidopteran caterpillars, sunning on an ivy leaf on a woodland edge, Wiltshire, UK, April.

Rod Williams / Parasitic fly (Eriothrix rufomaculata) on Tansy flower, Brockley, Lewisham, London, England, August.

Rod Williams / Parasitic fly (Eriothrix rufomaculata) on tansy flower, Brockley, Lewisham, London, England, August.

Rod Williams / Female Tachinid fly (Cistogaster globosa) on Tansy flower, Brockley, Lewisham, London, England, August.

Konrad Wothe / Tachnid fly (Tachinidae) Panguana Reserve, Huanuca province, Amazon basin, Peru.

Andy Sands / Tachnid fly (Tachina grossa) Surrey, England, UK. August.

Andy Sands / Tachnid fly (Tachina grossa) Surrey, England, UK. August.

Stephen Dalton / Parasitic fly (Dexia) Sussex, England, UK. July.

Rod Williams / Tachinid fly (Gymnosoma rotundatum) grooming, Brockley cemetery, Lewisham, London, UK, September.

Jussi Murtosaari / Flies (Brachycera) on leaf, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. June

Rod Williams / Tachinid fly (Tachina fera) Brockley cemetery, Lewisham, London, England, UK. May

Jussi Murtosaari / Fly (Brachycera) on Lily of the Valley berries, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. September

John Abbott / Parasitic Fly (Tachina sp.) on white background, Missoula County, Montana, USA.

Stephen Dalton / Tachinid fly (Alophora hemiptera) parasitic species. Sussex, England, UK, August.

Stephen Dalton / Tachinid fly (Alophora) Sussex, England, UK, August.

Piotr Naskrecki / Tachinid Fly (Tachinidae), Woburn, Massachusetts

Nick Upton / Parasite fly / Tachinid fly (Phasia hemiptera) a parasite of shieldbugs, feeding on ornamental flowers, Wiltshire garden, UK, August. . Property released.

Nick Upton / Parasite fly / Tachinid fly (Phasia hemiptera) a parasite of shieldbugs, feeding on ornamental flowers, Wiltshire garden, UK, August. . Property released.

Nick Upton / Parasite fly / Tachinid fly (Gymnosoma sp) a parasitoid of Shield bugs, feeding on Rock samphire / Sea Fennel flowers (Crithmum maritimum) Samos, Greece, August.

Nick Upton / 2020VISION / Parasite fly (Tachina fera), feeding on Mexican orange blossom (Choisya ternata) flowers in a garden, Wiltshire, England, UK, April . Property released.

John Abbott / Feather-legged fly (Trichopoda lanipes) female resting on flower, Sam Houston National Forest, Texas, USA, June

Andy Sands / Tachinid fly (Phasia hemiptera) male, the female lays its eggs directly onto Forest Bugs and Green Shield Bugs where the larvae live as parasites, Hertfordshire, England, August

Andy Sands / Tachinid fly (Phasia hemiptera) male, the female lays its eggs directly onto Forest Bugs and Green Shield Bugs where the larvae live as parasites, Hertfordshire, England, August

Kim Taylor / Parasitic Fly (Tachinidae) feeding on Hogweed (Heracleum sphondylium) flowers. Surrey, UK, June.

Nick Upton / Parasite Fly / Tachinid Fly (Cylindromyia intermedia) feeding on Variegated Spurge (Euphorbia marginata) flowers. Lesbos / Lesvos, Greece, August.

Nick Upton / Parasite Fly / Tachinid Fly (Cylindromyia intermedia) feeding on Variegated Spurge (Euphorbia marginata) flowers. Lesbos / Lesvos, Greece, August.

Nick Upton / Parasite Fly / Tachinid Fly (Cylindromyia intermedia) feeding on Variegated Spurge (Euphorbia marginata) flowers. Lesbos / Lesvos, Greece, August.

Nick Upton / Parasite fly / Tachinid fly (Zophomyia temula), a nationally scarce species, with very worn wings, feeding on Common hogweed (Heracleum sphondylium) flowers. Wiltshire meadow, UK, June.

Nick Upton / Parasite fly / Tachinid fly (Zophomyia temula), a nationally scarce species, sunbasking on a leaf in calcareous grassland. Wiltshire, UK, June.

Nick Upton / Parasite fly / Tachinid fly (Linnaemya sp.) female feeding on Wild angelica (Angelica sylvestris) umbel flowers. Corsica, France, June.

Nick Upton / Parasite fly / Tachinid fly (Cylindromyia bicolor) female feeding in profile on Wild angelica (Angelica sylvestris) umbel flowers. Corsica, France, June.

Nick Upton / Parasite fly / Tachinid fly (Tachina fera) using proboscis to take nectar from Ivy (Hedera helix) flowers. Wiltshire garden, UK, September.

Nick Upton / Parasite fly / tachinid fly (Tachina fera) using proboscis to take nectar from Ivy (Hedera helix) flowers. Wiltshire garden, UK, September.

Nick Upton / Tachinid / Parasite fly (probably Ramonda spathulata) a parasitoid of noctuid moth caterpillars, Wiltshire, UK, June.

Michael Durham / Tachinid Fly (Archytas apicifer) flying, photographed in 1/50,000th of second with a high-speed camera, Texas

Mark Moffett / Tachinid Fly (Phytomyptera melissopodis) portrait, Massachusetts

Chien Lee / Tachinid Fly (Tachinidae), Cosanga, Ecuador

Scott Leslie / Tachinid Fly (Tachinidae), Nova Scotia, Canada

Scott Leslie / Tachinid Fly (Tachinidae), Nova Scotia, Canada

Scott Leslie / Tachinid Fly (Tachinidae), Nova Scotia, Canada

Scott Leslie / Tachinid Fly (Tachinidae) on a yellow flower, Nova Scotia, Canada

Cyril Ruoso / Tachinid Fly (Calodexia sp) pair mating, Barro Colorado Island, Panama

Premaphotos / Parasite fly female (Tachinidae) about to lay her eggs on a group of caterpillars of the Lackey moth (Malacosoma neustria). The fly larvae will parasitize the caterpillars. UK

Premaphotos / Parasite fly (Dexiosoma caninum) in woodland, UK

Premaphotos / Red-blotched parasite fly (Eriothrix rufomaculata) on Ragwort flowers, UK

Premaphotos / Parasite fly (Dexiosoma caninum) UK

Premaphotos / Parasite fly (Linnaemya / Linnaemyia vulpina) on heathland, UK

Premaphotos / Parasite fly (Phasia hemiptera) in woodland, UK

Premaphotos / Parasite fly (Pelatachina tibialis) laying eggs on caterpillars of the Small tortoiseshell butterfly (Aglais urticae) UK

Doug Wechsler / Tachnid fly / Bristle fly (Juriniopsis adusta) resting on tree bark, Pennsylvania, USA. August.

Doug Wechsler / Bristle fly (Vibrissina sp.) parasitising Saw fly (Arge coccinea) larva, Wissahickon Valley Park, Pennsylvania, USA. July.

Doug Wechsler / Bristle fly (Gonia sp.) portrait, Pennsylvania, USA. April.

Doug Wechsler / Bristle fly (Gonia sp.) portrait, Pennsylvania, USA. April.

Doug Wechsler / Tachinid fly (Archytas metallicus) resting on a hand, Wissahickon Valley Park, Pennsylvania, USA. July.

Doug Wechsler / Flesh fly (Sarcophagidae) investigating a Tachinid fly (Archytas metallicus) on human skin, Wissahickon Valley Park, Pennsylvania, USA. July.

Nick Upton / Giant tachinid / Yellow-faced fly (Tachina grossa) nectaring on Hemp agrimony (Eupatorium cannabinum) flowers, Strumble Head, Pembrokeshire, Wales, UK. August.

Chris Mattison / Tachinid fly (probably Tachina fera) feeding on Ivy (Hedera sp.) flowers, Wales, UK. October.

Doug Wechsler / Parasitic fly (Calodexia sp.), an army ant associate, parasitizing insects escaping from army ants (Eciton sp.), La Selva Biological Station, Costa Rica.

Nick Upton / Parasite fly / Tachinid fly (Prosena siberita) with distinctive long proboscis, a parasite of chafer beetles, resting on photographer's leg, Pewsey Downs, Wiltshire, UK, July.

Andy Sands / Tachnid fly (Eriothrix rufomaculata) a common Tachnid fly found in damp meadows photographed at dawn covered in dew, Hertfordshire, England, UK, July - Focus Stacked

Rod Williams / Tachinid parasitic fly (Thelaira nigripes) Sutcliffe Park Nature Reserve, Eltham, London, England, UK, June.

Rod Williams / Tachinid parasitic fly (Blepharipa pratensis) Rare species, new to London area Beverley Court Gardens, Lewisham, London, England, UK. May.

Rod Williams / Tachinid parasitic fly (Blepharipa pratensis) Rare species, new to London area. Beverley Court Gardens, Lewisham, London, England, UK, May.

Doug Wechsler / Tachinid fly (Juriniopsis adusta) on fern, Morris Arboretum, Pennsylvania, September.