Cheetahs rely on sight to hunt, rather than scent like many other predators. They typically hunt during the day, when there is still light out, as they have relatively poor night vision. Cheetahs can see up to 5km away in detail and like to find higher ground, from which they can see far off into the distance. They have binocular vision, which is facilitated by their small, flat heads and large, forward-facing eyes. The cheetah's high-set eyes, along with their small rounded ears, allow them to spot prey more easily in tall grasses without being seen themselves. The cheetah's fovea (a small area inside the eye which provides the sharpest image) is elongated, while the human's fovea is round. This feature provides cheetahs with a sharper more wide-angle view than humans, which is one of the cheetah's many adaptations for speed. Cheetahs also have specialized inner ear structures that help stabilize their vision at high speeds, in addition to helping with balance like the human's inner ear structures. Their eyes are shut at birth and open in 7 to 10 days. Cubs are born with dark-coloured eyes that get lighter as they get older. Adult cheetahs' eyes range from light yellow to dark amber in colour.
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