But birds also have a "third eyelid" – a nictitating membrane which is located between the cornea (the membrane covering the eye surface) and the upper and lower eyelids. A chicken gets along well with this type of vision because it doesn't need to see distances but it does need to see the ground in front of it to find food to peck.īirds have moveable upper and lower eyelids, just like humans. This type of sight is called monocular vision. This arrangement gives these birds very little binocular vision, but gives them better vision all around them, which allows them to watch for predators. On the other hand, a songbird such as the Indigo Bunting has eyes on the sides of its head. Having both eyes on the front of the head gives a bird (and a human) binocular vision (the ability to see the same object with both eyes at the same time). For this reason, the hawk is able to judge distances and focus on prey at a distance. For example, the Red-tailed Hawk's eyes are located on the front of its head, just like a human's. ![]() The placement of a bird's eyes can tell you whether it's a predator or prey species. In fact, some owls have larger eyes than humans! In birds, eyes make up about 15 percent of the weight of the head. This ratio holds true for many bird species.īut when you compare the size of the eyes to the size of the head, you find that in humans, eyes make up less than one percent of the weight of the head. In a human, the head is about a tenth of the total body weight. You see it in the size of a bird's eyes – they are huge in proportion to a bird's body. You can just look at a bird and know that vision is its key sense. ![]() ![]() A buzzard's vision is six to eight times better than yours. Most all birds have better vision than humans and other mammal species. (Some hawks can see every mouse in a field while flying over on the hunt.) Raptors such as eagles and hawks have marvelous vision. If anyone ever calls you "Eagle Eyes," you can feel very flattered.
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