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House fly (Musca domestica) on flowering plant
Delia antiqua - onion fly is a cosmopolitan pest of crops, resting on marsh spurge - Euphorbia palustris
Flies on wild plants, North China
Black Fly
A fly standing on a violet petal in the garden
Hoverfly on a faded flower
A small fly sits on a bright yellow flower. Macro photography
a fly sits on a yellow sunflower
Close up of a blow fly on a leaf
Flies on wild plants, North China
Focus here is on a domestic fly sheltering in a golden daffodil trumpet. Daffodil trumpets provide one of the largest - and strongest - yellows amongst the spring garden flowers of the UK. Appropriately, since the daffodil is the national flower of Wales, they start to burst their buds and sport their yellow petals around March 1st, St. David's Day.
burgundy bud with a fly, fly on a red flower, green fly, insect on burgundy flower, flower just opening, close-up insect on flower
Calliporidae (green bottle blow fly) Found in most parts of the world. These are in Sydney Australia, sitting on a Mulla mulla flower.  The Mulla Mulla is a Australian wildflower of the outback.
Green fly on a yellow flower, Lucilia sericata. Insect close-up.
The common green bottle fly is a blowfly found in most areas of the world and is the most well-known of the numerous green bottle fly species. Its body is 10–14 millimetres in length – slightly larger than a house fly – and has brilliant, metallic, blue-green or golden coloration with black markings
Little bee on flower
A close up of a Zinnia with pink flower and yellow florets in Stukeley Meadows Nature Reserve Huntingdon, Cambridgeshire.  There is a greenbottle fly perched on a petal.
Twenty Galapagos bird species, including 12 species of Darwin’s finches, are under threat from a parasitic fly, Philornis downsi. This fly was accidentally introduced to Galapagos and is seriously affecting the survivorship of several Galapagos birds including the critically endangered Mangrove Finch. Flies are adept at locating bird nests to lay their eggs. Once larvae hatch they feed on the blood of hatchlings, sometimes causing all of the chicks in a nest to die
An fly sitting an a flower, blurred background, bokeh
Fly insects
Blow-fly Lucilia Sericata on the white flower, extreme close-up shot with high details
Scathophaga stercoraria, commonly known as the yellow dung fly or the golden dung fly, is one of the most familiar and abundant flies in many parts of the Northern Hemisphere. As its common name suggests, it is often found on the feces of large mammals, such as horses, cattle, sheep, deer, and wild boar, where it goes to breed.
outdoors: single housefly resting on top of a hydrangea bud.
Detail of a bee on a large yellow flower. Blurred background.
Hoverlfy on daisy,Eifel,Germany.
European Green blowfly (lucilia sericata) sitting on a red and orange pansy flower, Cape Town, South Africa
A housefly on a yellow flower, basking in the sun.
Fly insects
Profile view of a fly on a yellow-centered white-petalled daisy-like flower
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