Humans belong to a select club of species that enjoy crisp color vision in daylight, thanks to a small spot in the center of the retina at the back of the eye. Other club members include monkeys and apes, various fish and reptiles, and many birds, which must home in on their scurrying dinners from afar or peck at tiny seeds. Less clear is what controls the formation of the high-acuity spot, known as the fovea in humans. Harvard Medical School researchers have now provided the first insight into this perplexing question by studying an unusual model: chickens.
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