Interestingly, not all cats have a green glow. Dr. Richter said that it actually depends on the cat's breed, age, and coat color. "Siamese cats tend to have a yellow shine and white cats with blue ...

As its pupils dilate the amount of colour that can be seen lessens. And in one adorable clip the cat is seen enjoying a warm bath. Different coloured eyes are more common in certain breeds ...

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.

Wild cats showcase a stunning diversity of eye colors, proving a mystery for researchers because most wild species are known to have narrow eye color schemes (usually black, brown or yellow).