Few people have spent time gazing into a sheep’s eyes, but if you have, you may have noticed something very strange about their pupils. Instead of being round, as is the case with humans, they ...

On Sept. 10, 2024, a claim spread on social media about the shape of goats' pupils. One Facebook user posted a meme that asked: "Have you ever noticed that goats have rectangular pupils?" The ...

Researchers used computer models based on a sheep’s eye to support theories about why horizontal, vertical and circular pupil shapes benefit different animals.

A new analysis finds that a land animals' ecological niche is a strong predictor of pupil shape. Species with pupils that are vertical slits are more likely to be ambush predators that are active ...

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) ...

There's a reason why the domestic cat's pupil has its distinctive, vertical slitted shape and the grazing goat's its horizontal, flattened look. In both cases, the eye's shape has evolved to help ...