Power of pupils is in their shape

Vertical and horizontal pupils provide visual advantages for predators and prey respectively, researchers say

Cat and horse pupils

SEEING SHAPES  Vertical pupils may help a predator like a cat (left) stalk its prey. Horizontal pupils, like a horse’s (right), may help potential prey spot a prowling predator and flee. 

From left: photophilde/Wikimedia Commons (CC BY-SA 2.0); Kalike/Wikimedia Commons (CC BY-SA 3.0)

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