![]() Not all predators, however, necessarily have eyes in the front of their heads. ![]() The reasoning behind this theory is that exceptional depth perception is useful when hunting for prey. This idea led to the theory that predators have forward facing eyes, and prey has them on the sides of their heads. Later, questions were raised about this theory due to other tree dwelling species such as squirrels that have eyes on the sides of their heads and thrive in the arboreal environment. One earlier theory presented that for human ancestors specifically, having a better sense of depth was highly beneficial for swinging through trees. Why might it be that animals evolved to utilize either one of these potential benefits? There are several different evolutionary theories. This allows us to see depth in a way that animals with eyes on the sides of their head cannot. What is the tradeoff? When the eyes face forward, such as with humans, the visual fields of each eye overlap. This panoramic viewpoint allows them to keep an eye on what is happening in a much wider range than if their eyes faced forward. When the eyes are on either side of the head, the animal will be able to see a very wide visual field, covering a large portion of the world around them. The first thing to investigate is the relative effects on vision eye placement may have, and the possible benefits of such placement. Have you ever wondered why this might be? For example, animals such as horses and goats have their eyes on the sides of their heads, where tiger and human eyes face forward. You may notice that they can be categorized by whether their eyes appear on the sides of their head or on the front of it. There are many ways to categorize these species based on their attributes. Across the world, there are an immense number of species that have all sorts of similarities and differences.
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