A Manx cat has what feature that affects its body type?
Manx cat:  Many Manx have a small stub of a tail, but Manx cats are best known as being entirely tailless; this is the most distinguishing characteristic of the breed, along with elongated hind legs and a rounded head. Cat body-type mutation:  Sometimes, these cat body-type mutations are striking enough that humans select for and perpetuate them.
tailless