Flies Calliphoridae - like to pollinate plants.

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Flies Calliphoridae have many kinds and different coloring. They are very sensitive to carrion and meat and immediately debug their eggs after discovering such protein stores. Their developing larvae need a lot of protein.
And the flies themselves are not averse to feasting on pollen and nectar from flowers. At their meal I suggest you take a look.

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Сamera: Nikon D3400 | 55mm
Photo by @grildrig.