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Humans have a triple cone structure of our eyes that allows us to see a spectrum based on our three primary colours: red, green and blue. However, birds have an additional cone allowing them to also see ultraviolet light. Not much is known about this as we cannot see it at all, but it is thought that birds developed this fourth cone in order to perceive contrasts in trees and foliage that to humans would just appear as a sea of greens. This helps them with finding food, hiding from or finding prey and navigating their way through forests.
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