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Why do gulls have ultraviolet vision?

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The first reason gulls have ultraviolet vision is because they inherited it from their ancestors, and they were faced with no evolutionary reason to cause them to lose it. read more

Raptors may have to pursue mobile prey in the lower part of their visual field, and therefore do not have the lower field myopia adaptation demonstrated by many other birds. Scavenging birds like vultures do not need such sharp vision, so a condor has only a single fovea with about 35,000 receptors mm 2. read more

However good we (arrogantly) think our color vision is, compared with that of birds it is rather poor, because they have four single-cone types: red, green, blue, and ultraviolet (UV). Not only do birds have more types of cones, they have more of them. read more

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