Nectar at the base of each flower petal may be the quixotic quest of this mosquito. Quixotic because the physical characteristics of benefit to human predation, a light body, makes it unsuited to delve into the petals.
Flowers are like people in emitting carbon dioxide, another mosquito attractant. If it is looking for blood here this mosquito is also at a loss.
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Another lily with a tiny fly (mosquito?) perched at the base.