It’s called the tapetum lucidum (Latin for “shining layer”) and it works like a small mirror to reflect light, helping cats see in the murk — another evolutionary adaptation that partially explains why your feline is so wired while you’re snoozing. Cat eyes are special in other ways, too. Their pupils grow up to 50% larger in dim light than ours do, allowing them to see more clearly, and they have more light-sensing rods in the back of their eyes. Dogs, cattle, deer, ferrets, and horses have the tapetum lucidum as well, but their eyes don’t all glow the same color. The hue has to do with the amount of pigment in their retina, as well as other substances in the tapetum, meaning that even two dogs of the same species might have eyes that reflect a different color. |
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