Slit-shaped pupils help animals adjust their eyes to see clearly day or night, but that attribute doesn’t explain why some animals have horizontal slit pupils and others have vertical ones. A study ...

Berkeley -- While the eyes may be a window into one's soul, new research led by scientists at the University of California, Berkeley, suggests that the pupils could also reveal whether one is a hunter ...

When it comes to telling apart prey and predator the eyes have it, new research has shown. Prey species such as sheep and goats can be distinguished by their “letterbox” pupils while those of cats, ...

This week's Question comes from Derek Sotheby in Burlington, Ontario. He asks: Why do some animals have slit-like pupils and some have round pupils? What are the advantages and disadvantages of each?

The pupils of domestic cats’ eyes are ovoid, but those of big cats such as lions and leopards are round like human pupils. Why is this and do the differences confer any advantage either way? • In ...

Blurry vision sounds like a reason to visit an eye doctor. But visual fuzziness might actually help some animals catch dinner. Out-of-focus areas created by vertically elongated pupils help predators ...

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