The American Bobtail is an uncommon breed of domestic cat which was developed in the late 1960s. It is most notable for its stubby "bobbed" tail about one-third to one-half the length of a normal cat's tail. This is the result of a cat body type genetic mutation affecting the tail development, similar to that of a Manx (cat). and the American Cat Fanciers Association (ACFA). The breed is technically now also sanctioned in the Cat Aficionado Association (CAA) of China, by virtue of the CAA having adopted all of ACFA's breed standards; it is unknown if any specimens are actually in China. The breed is "recognized" (as existing), as both American Bobtail Longhair and American Bobtail Shorthair, in the Germany-based World Cat Federation (WCF), but is not "accepted" for competition