Close up of snow leopard at zoo. (Image credit: Ellen van Bodegom via Getty Images) Tabin and his co-author documented the eye colors of more than 40 cat species by looking at cat images online.

It’s not just the fur or the purr that cats use to hold us spellbound: It’s those eyes. Whether they are blue, green, gold, copper or some variation of those shades, a cat’s eyes are one of ...