Cats
existing Rex breeds, others are due to the Rex mutation spontaneously occurring in a
longhaired breed. These include the Angora German Rex, Bohemia Rex (Rexed Persian),
LaPerm Longhair, Longhair Devon Rex, Rexed Himalayan, Rexed Maine Coon. Combined
with Persian-type longhair and undercoat, the Rex mutation can be unruly and unattractive - a
Persian with a "bad hair day". With semi-longhair or longhairs without a woolly undercoat,
the fur is soft, ringletted or wavy. In many cases, the curling of the hair makes it appear
shorter and denser than it really is.