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](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/08/080715_ss_pupils_free.jpg?fit=860%2C460&ssl=1)
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)