Why does insert pollinated flowers has bright petals?

Why does insert pollinated flowers has bright petals?
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The brightly coloured petals are to entice a visit from a pollinated insect. But, it has been discovered that what we, humans, see when looking at a flower is not what visiting insects see. It seems that ultraviolet light changes the appearance of the flower head, guiding in approaching insects like the lights that mark the runway for an approaching aeroplane at an airport.
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