Michael D. Kern / Kaleidoscope pattern formed from picture of Greenbottle blue tarantula (Chromatopelma cyaneopubescens) - see original image number 01482830 EMBARGOED FOR NAT GEO UNTIL the end of 2015

Michael D. Kern / Green bottle blue Tarantula, (Chromatopelma cyaneopubescens) captive from Venezuela

Cyril Ruoso / Green blowfly (Lucilia sericata) on Prunus (Prunus sp) blossom. Bourgogne-Franche-Comte, France. April.

Ernie Janes / Greenbottle fly (Dasyphora cyanella) close up

Ernie Janes / Greenbottle fly (Dasyphora cyanella) close up

Jiri Lochman / Green blowfly (Lucilia sericata) male, Western Australia.

Rod Williams / Greenbottle (Lucilia sp) Brockley Cemetery, Lewisham, London, England, UK. July.

MYN / Lily Kumpe / Green blowfly (Lucilia sericata) Queensland, Australia. Meetyourneighbours.net project.

Rod Williams / Greenbottles (Lucilia sp) mating pair, Ladywell Fields, Lewisham, South East London, England, UK, July.

Alex Hyde / Greenbottle (Lucilia caesar) feeding on Hemp agrimony (Eupatorium cannabinum) Strumpshaw Fen, Norfolk, UK, September.

Nick Upton / Hoverfly (Eristalis nemorum) and Greenbottle (Lucilia) nectaring on Wild marjoram (Origanum vulgare) flowers in a chalk grassland meadow, Wiltshire, England, UK, August.

Rod Williams / Greenbottle flies (Lucilia sp) mating pair, Brockley, Lewisham, London, UK June

Doug Wechsler / Green bottle fly (Lucilia sp) pollinating white snakeroot, Philadelphia, USA October

Nick Upton / Two Greenbottles / Blowflies (Lucilia sp.) foraging on a ripe Blackberry (Rubus plicatus), GWT Lower Woods reserve, Gloucestershire, UK, July.

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 / Greenbottle (Lucilia sp) on Everlasting sweet pea flower, Brockley Cemetery, Lewisham, London, England, August.

Michael D. Kern / Kaleidoscope pattern formed from picture of Green bottle blue tarantula (Chromatopelma cyaneopubescens). See original image number 01194383.

Rod Williams / Greenbottles (Lucilia Sp) mating pair showing colour variation, Ladywell Fields, Lewisham, London, England, UK. April

Alex Hyde / Greenbottle (Lucilia caesar) Peak District National Park, Derbyshire, UK. July.

MYN / Pierre Escoubas / Blow fly / greenbottle (Lucilia sp) Valbonne, France, July. Meetyourneighbours.net project.

Michael D. Kern / Greenbottle blue tarantula (Chromatopelma cyaneopubescens), captive, from Venezuela

Robin Chittenden / Greenbottle Fly (Lucilia sp) on leaf, England, UK, July.

Stephen Dalton / Green bottle (Lucilia sp) on faeces, Sussex, England, UK, August.

Stephen Dalton / Garden spider (Araneus diadematus) with greenbottle fly. Sussex, England, UK, October.

Rod Williams / Greenbottles (Lucilia sp) feeding on dog faeces Lewisham, London, England, UK, September.

Rod Williams / Greenbottles (Lucilia sp) feeding on dog faeces Lewisham, London, July

Rod Williams / Female Greenbottle (Lucilia sp) Lewisham, London, May

Roland Seitre / Greenbottle Blue Tarantula (Chromatopelma cyaneopubescens) on web, native to Venezuela

Roland Seitre / Greenbottle Blue Tarantula (Chromatopelma cyaneopubescens). Captive. Vivarium parque del Este Vivarium, Caracas, Venezuela. Endemic to Venezuela and other tropical South American countries.

Rod Williams / Greenbottle / Blowfly (Lucilia caesar) on leaf, South London, UK, August

Rod Williams / Greenbottle / Blowfly (Lucilia caesar) on leaf, South London, UK, October

Rod Williams / Greenbottle (Lucilia sp) South London, UK, August

Nick Upton / Single male of an overwintering species of Greenbottle (Eudasyphora cyanella) sunbasking in early spring sunshine on Forsythia flower. Wiltshire garden, UK, March.

Ernie Janes / Green bottle flies (Eudasyphora cyanella) feeding on cow dung, Norfolk, UK, August

Ernie Janes / Green bottle flies (Eudasyphora cyanella) feeding on cow dung, Norfolk, UK, August

Nick Upton / Greenbottle / Muscid fly (Eudasyphora cyanella), preparing to take off from a Variegated mock orange (Philadelphus coronarius "aureus") leaf. Wiltshire, UK, June

Nick Upton / Bluebottle (Calliphora vicina) Greenbottle (Eudasyphora cyanella) and Yellow Dung Fly (Scathophaga stercoraria) feeding on Alexanders (Smyrnium olusatrum) flowerhead. Cornwall, UK, April.

Nick Upton / Male Greenbottle fly (Eudasyphora cyanella) sunbasking on a leaf. This is an overwintering species. Wiltshire, UK, March

Nick Upton / Two male Greenbottle flies (Eudasyphora cyanella) competing with one another as they search for mates. This is an overwintering species. Wiltshire, UK, March

Michael D. Kern / Greenbottle blue tarantula (Chromatopelma cyaneopubescens) female, captive, from Venezuela

Nick Upton / Close up of Greenbottle / Blowfly (Lucilia sp.) inspecting a dead mole, before laying eggs on it. Wiltshire garden, UK, June.

Nick Upton / Greenbottle / Blowfly (Lucilia sp.) inspecting a dead mole, before laying eggs on it. Wiltshire garden, UK, June.

Nick Upton / Portrait of Greenbottle / Blowfly (Lucilia sp) standing on rose leaf. Wiltshire garden, UK, June.

Nick Upton / Greenbottle / Blowfly (Lucilia sp.) at rest on rose leaf, Wiltshire garden, UK, June.

Nick Upton / Greenbottle / Blowfly (Lucilia sp.) inspecting a dead mole, before laying eggs on it. Wiltshire garden, UK, June.

Nick Upton / Greenbottle / Blowfly (Lucilia sp.) inspecting a dead mole, before laying eggs on it. Wiltshire garden, UK, June.

Andy Sands / Greenbottle (Lucilia caesar) resting on leaf, Hertfordshire, England, UK

Stephen Dalton / Greenbottle fly {Lucilia sp} taking off, UK

Stephen Dalton / Greenbotle fly {Lucilia sp} feeding on Fleabane flower, UK

Stephen Dalton / Greenbottle fly {Lucilia sp} taking off, UK

Michael D. Kern / Greenbottle blue tarantula {Chromatopelma cyaneopubescens} captive, from Venezuela

Rolf Nussbaumer / Green Bottle Fly, Lucilia / Phaenicia sericata} adult, Hill Country, Texas, USA

LYNN M. STONE / Greenbottle blue tarantula on leaves {Chromatopelma cyanopubescens} captive

Philippe Clement / Greenbottle fly (Lucila sp) eggs on dead Red squirrel (Sciurus vulgaris) Belgium

Philippe Clement / Greenbottle {Lucilia sp} eggs on dead Red squirrel {Sciurus vulgaris}, Belgium

Kim Taylor / Greenbottle Fly {Lucilia sp} on tree bark.

Kim Taylor / Greenbottle fly eggs {Lucilia sp} on dead Rabbit fur. UK.

Kim Taylor / Greenbottle fly {Gymnochaeta viridis} on Spurge, UK.

Philippe Clement / Blowflies / Greenbottles feeding on dead bird {Lucilia caesar} France

Kim Taylor / Giant Greenbottle Fly (Lucilia sp) Western Australia. Captive

Heidi & Hans-Juergen Koch / Greenbottle Fly (Lucilia caesar) mass of newly hatched flies on cocoons, worldwide distribution

Heidi & Hans-Juergen Koch / Greenbottle Fly (Lucilia caesar) close-up of compound eye, worldwide distribution

Heidi & Hans-Juergen Koch / Greenbottle Fly (Lucilia caesar) mass of newly hatched flies, worldwide distribution

Heidi & Hans-Juergen Koch / Greenbottle Blue Tarantula (Chromatopelma cyaneopubescens) in defensive posture at entrance to nest, native to Venezuela

Heidi & Hans-Juergen Koch / Greenbottle Blue Tarantula (Chromatopelma cyaneopubescens) portrait, native to Venezuela

Heidi & Hans-Juergen Koch / Greenbottle Blue Tarantula (Chromatopelma cyaneopubescens) portrait, native to Venezuela

Scott Leslie / Greenbottle Fly (Lucilia sericata) pollinating a daisy, Nova Scotia, Canada

Premaphotos / Greenbottle fly / Blowfly (Lucilia caesar) on a rotting apple, UK

Premaphotos / Greenbottle fly maggots (Lucilia sp) on a dead rabbit, UK

Premaphotos / Greenbottle fly / Blowfly (Lucilia caesar) on a dead pigeon, UK

Premaphotos / Bluebottle fly (Calliphora vicina) left, and Greenbottle fly {Lucilia sp} right, on the corpse of a baby Pigeon. UK

Michael Hutchinson / Flower crab spider (Misumena vatia) female, on flower clutching Greenbottle fly (Lucilia sericata) prey, Bristol, UK. June. Focus stacked.

Michael Hutchinson / Flower crab spider (Misumena vatia) female, on flower clutching Greenbottle fly (Lucilia sericata) prey, Bristol, UK. June.

Neil Aldridge / Close up of domestic cattle (Bos taurus) noses surrounded by flies, Cornwall, England, UK, October.

Neil Aldridge / Close up of domestic cattle (Bos taurus) noses surrounded by flies, Somerset, England, UK, August.

Neil Aldridge / Close up of Domestic Cattle (Bos taurus) faces surrounded by flies, Somerset, England, UK, August.

Neil Aldridge / Close up of domestic cattle (Bos taurus) chewing whilst surrounded by flies, Somerset, England, UK, August.

Phil Savoie / Greenbottle fly (Lucilia sericata), Monmouthshire, Wales, UK, February.

Georgette Douwma / Greenbottle (Lucilia caesar) flies on a chicken bone. UK.

Georgette Douwma / Greenbottle (Lucilia caesar) flies on a chicken bone. UK.

Doug Wechsler / Blow fly (Lucilia) Wissahickon Valley Park, Pennsylvania, USA, September.

Nick Upton / Greenbottle (Eudasyphora cyanella) basking on a Spurge in early spring sunshine, Wiltshire garden, UK, March.