According to Isle of Man records the tailless trait of the Manx (and ultimately the Cymric) began as a mutation among the island's domestic cat population. Given the island's closed environment and small gene pool, the dominant gene that decided the cats' tailless was easily passed from one generation to the next, along with the gene for long hair. Long-haired kittens had been born to Manx cats on the Isle of Man, but had always been discarded by breeders as "mutants". Then, in the 1960s, similar kittens were born in Canada and were intentionally bred. This was the start of the increase of Cymric popularity. It took many years for the Cymric to be recognized as a breed of its own by cat associations. The Manx was recognized in the 1920s, but the Cymric was not shown until the 1960s and did not begin to gain popularity until the mid-1970s.
Cymrics are intelligent, fun-loving cats, and they get along well with other pets, including dogs. Cymrics are very loyal to their humans and enjoy spending quality time with them. As cats go, they can be easily taught tricks. Despite their playful temperament, they are gentle and non-aggressive. However, Cymrics are usually not overly demanding of attention. Cymrics are very playful and are exceptional jumpers. Like Manx, Cymrics are fascinated by water.
All colours and patterns that are accepted for the Manx Cat are accepted for the Cymric.