Instead, such animals rely on overlapping images seen through two vertical slits, which have unique optical properties that aid in depth perception. But movement could give away an ambush predator's location, said Banks. Many animals calculate distance by moving their heads, using the fact that nearby objects will travel further across their field of view. ![]() These animals must judge distances precisely in order to strike prey with one sudden lunge. Here on Earth, almost every creature with vertical pupils is an ambush predator - something that hides low to the ground and waits for prey to come close. ![]() But for a real dragon, those pupils would come at the cost of crisp vision over long distances. When designing dragons for a human audience, it makes sense to give them catlike pupils, since we see such eyes as dangerously alien, said Banks.
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