Tigers have round pupils, but domestic cats have vertical slits in the center of their eyes. What gives? A census of the shapes of animals' pupils suggests size and way of life each play a big role.

Frog and toad pupils come in quite the array, from slits to circles. But overall, there are seven main shapes of these animals’ peepholes, researchers report in the Aug. 25 Proceedings of the ...

Why do some animals have vertical slits, while others have round pupils like ours? Discover how pupil shape is connected to an animal's predator-prey role, hunting habits, and time of activity. From ...

The Wide World of Pupil Shapes; Pupil Shape in Predators and Prey. In a study published in 2015, vision scientist Martin Banks found that the shape of an animal’s pupils is a clue to its place ...

WebMD offers an eye-opening look at your pupils and what they can tell you. Skip to main ... If you don't get it treated it can leave you with scar tissue that can make your pupil’s shape irregular.

Professor Lars Schmitz joins WIRED to guide us through a giant tree of life mapping the evolution of eyes in the animal kingdom: how they work, why they've taken the form they have, and the ...

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 ...

The yellow-bellied toad is sure to win the hearts of even the most hesitant of anuran appreciators, being an adorable little amphibian with heart-shaped pupils. Exactly what the pupil shape means ...

The PERRLA eye exam is like a physical for your eyes. But it can also help indicate neurological conditions. Find out more about what it is and how it works.

Rayna Bell, a herpetology expert and curator at the California Academy of Sciences, told Snopes it's true that some frogs have heart-shaped pupils, adding that the photo in question appears to be ...