Curly-coated (rexed) Maine Coons
The go-to book on cat genetics calls them 'rex mutants' or 'rexoid mutants'. Sounds like an alien creature. They are referring to cats with curly coats due to the presence of an inherited genetic mutation. There are some well-known rex cat breeds such as the Selkirk Rex (cat in sheep's clothes) and Cornish Rex. There are others. Surprisingly the Maine Coon can also have a curly coat as the book I mention, Robinson's Genetics for Cat Breeders and Veterinarians , states, "Rexed kittens with a recessive mechanism of inheritance have also been reported in the Maine Coon and colorpoint longhair (Himalayan)." Rexed Maine Coon. Picture in public domain. This is not a good picture in terms of quality but this is unsurprising as photos of this cat are exceedingly rare. The go-to website for information about rexed cats is Sarah Hartwell's messybeast.com as she is the best qualified in the UK (the world?) on cat genetics. She mentions that curly-coated Maine...