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Flowers are in the business of attracting pollinators. Many pollinators such as bees and syrphid flies not only see colors in visible light, but also can see in the ultraviolet spectrum ('below' the purples in wavelength). Many flowers that seem to us to be just plain white or yellow, have markings in the ultraviolet spectrum that make the location of the flower's landing-zone more apparent, but may also help bees and others tell flowers apart, because bees tend to stick to a certain species of flower for a time (and it's in the best interest of pollen-producing plants). Although honey bees see mostly the same colors we do, they can only differentiate between six major categories of color, including yellow, blue-green, blue, violet, ultraviolet (below purple), and also a color known as "bee's purple," which is a mixture of yellow and ultraviolet. To the best of our knowledge, bees can not see red. They see best in the blue-green, violet, and bee's purple color ranges.
Interestingly, bees have compound eyes. Thru investigation, it seems probably that the advantage of the compound eye is its ability to detect movement. Honey bees can easily differentiate between solid and broken patterns, but show a preference for broken figures. It would seem that their eyes are better adapted to perceiving movement rather than form. Related to this, bees seem to respond more readily to moving flowers than to stationary ones. It may be why many flowers are also delicate in nature and move easily with the wind (I know this from trying to photograph them in the field).
In the above case of Butter and Eggs, the UV pattern may suffice to attract many different bees and flies, but the plant selects out only those pollinators of just the right size and weight. The preferred pollinators are the ones able to trigger the flower to open, while all others are excluded. This helps ensure that a specific pollinator that specializes in carrying pollen from other Butter and Eggs is the only one to gain entry. This strategy may be used for plants that flower during the time of year when there are many other flowers blooming at the same time.
ALSO OF NOTE I found one reference to a spider that uses UV strands of its web to possibly mimic the landing pattern of a flower, thus attracting nectar-foraging prey such as bees and flies directly into its trap. I could not find out what type of spider nor what type of flower it imitated, so this may just be speculation on someone's part. However, given that nature, in all her beauty and diversity, usually leaves no niche unexplored, i don't doubt the possibility. Interestingly, we are finding out that UV colors may communicate a wide variety of information for animals that can see it. Among them, butterflies seem to use UV patterns to be able to tell their sexes apart, and female blackbirds may use the ultraviolet sheen of males to help select the best mate. I'm sure the list goes on and on.
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