You may be surprised to know, but cats can have some unique genetic abnormalities, just like humans. Some of us can be born with things like super flexibility, or an incredible memory, or being born without fingertips. Cool things. Amazing things. Cats are the same. Some cats are born tiny and never grow up, staying the size of an itty bitty kitty forever. Other cats can be born with two noses, both of which are functional, they're just a little louder than most. Other cats are born with extra toe-beans - they're called polydactyl cats, and yes, they are absolutely adorable.
And apparently, some cats can be born with an extra set of ears. Meet Audio, a cat who has one of the most fitting names that we have ever heard of. Because both of his ear sets are indeed functional, and apparently, his second ear set has a life of its own. The second set is a little smaller than the first, and it's most likely going to stay like that furrever, but you know what… we think it's kind of adorable.
source https://cheezburger.com/39258373/extremely-rare-cat-born-with-4-ears-that-was-found-abandoned-in-a-box-outside-is-now-adopted-and