Scientists have confirmed that most birds see colors. Humans’ eyes have three types of color-sensitive cones that allow us to see three primary colors in terms of light are red, green and blue. Birds' eyes have four types of color-sensitive cones which allow many birds to also perceive ultraviolet (UV) light.
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Being able to see a broader spectrum of light can make as big a difference as watching black & white verses color television.
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Although unsure how birds benefit from their enhanced visual perception, you can assume from the way UV light reflects from their feathers that it might play a part in mate selection. And for nectar eating birds like the hummingbirds, a flower’s secret pattern on the petals act as arrows, to guide the pollinating birds and insects to the right spot.
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So there is no need to worry if you received a blue hummingbird feeder as a gift and there is no need to color your nectar (sugar water) with red food coloring. Click HERE for a more detailed sugar recipe.
Source: Bird Vision- http://en.wikipedia.org/wiki/Bird_vision
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