Have you ever heard of the 'cat mirror theory'? It's the idea that when cats see their reflections in a mirror that they don't recognize themselves and instead think they're looking at another cat.

Add Yahoo as a preferred source to see more of our stories on Google. There are a million different reasons why cats make us smile and make our lives infinitely better. From the purrs and cuddles to ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. After five years of living, one might think cats have learned all they can, but a cat named Butters has shown he is still ...