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Depth is perceived when each eye provides a slightly different view of the same scene, when there is an overlap in the field of vision. This is known as binocular vision. Birds such as Owls, which have both eyes facing forward, have binocular vision similar to our own, but most nonpredatory birds have eyes whose fields of view do not overlap enough to provide this ability. Instead, their laterally placed eyes give them a wider total view, the better to detect an approaching predator. Scientist believe that to compensate for their lack of binocular vision, some birds bob their heads, thereby viewing the same subject rapidly from different angles.

In many species, eye color changes as the bird matures and can serve as a means of determining an individual's age. For American Crow, it changes from blue or blue-gray to brown. These birds are not color blind.

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Q: Are crows color blind
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