Scientists have finally narrowed down on a long theorised elusive genetic mutation that makes orange cats so unique, unlike any other mammal. While the orange fur colour can be seen across mammals, including tigers,

Chris Kaelin, a geneticist at Stanford Medicine, found himself thinking about cats. Not just any cats, but the loud, lovable, and often male ones streaked in unmistakable marmalade. These orange felines — icons of internet memes and cozy laps — have baffled scientists for over a century.

Two separate research teams have detailed the answer in two studies published Thursday in the journal Current Biology. They’ve identified the precise genetic mutation in these cats that explains their orangeness—a mutation not seen in other animals with similar coloration.