The genetic variability of cats does not compare with that of dogs, which may be so different in some cases, such as in that of a miniature poodle and a mastiff, that it is hard to believe that the individuals represent the same animal. Indeed, most cat breeds are chiefly distinguished by differences in the texture and color of the fur, rather than by body type, size, or shape. The Persian and the Himalayan, for instance, are both long-haired breeds, but the Persian may exhibit a wide variety of colors, while the Himalayan is white or cream colored with the dark markings at the extremities that are typically associated with the short-haired Siamese cat. A hairless cat called the Sphynx is a mutant variety, as is the curly-coated Devon Rex.