Despite its obvious liking for comfort and human company, the domestic cat has many of the same characteristics as its wild relations. it shares the lithe muscularity of a body built for stalking and hunting and a fine furred pelt with the big roaring cats of the jungle savanna. In fact, there are smaller wild species that have a times left their feral state to cohabit with humans. At this level, the boundaries between wildness and domesticity remain fluid. For although the domestic feline appears to have a smaller brain than the wild counterpart, if forced by circumstance, it can quite easily revert to the free-roaming, independent life of a wild predator.
via - The Ultimate Encyclopedia Of Cats, Cat Breeds & Cat Care