Most species have a singular eye color with no variation. So, it's really surprising that once you get into the cats—lions, tigers, panthers, etc.— we see all these different eye colors.

Their model found that the ancestor of all cats must have had gray and brown eyes, and the gray enabled other colors to later ... study have suggested different possible explanations.

Esmé’s Mom DEAR ESME’S MOM: I, too, have fallen into reverie staring into the eyes of a cat. My experience with our therapy cat Spencer is similar to yours with Esmé. Spencer is an all-black ...

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).

More From Newsweek Vault: Compare Affordable Pet Insurance Plans Rachel, who didn't give a surname, said that Clementine's natural eye color has ... the "Halloween cat" all dressed for the season ...

"All kittens are born with blue eyes and at about 6 weeks of age they begin to develop their adult color" and "feral cats typically have hazel colored eyes." Some cats may even have one blue eye ...