The Manx cat's iconic taillessness is a genetic mutation that can be fatal

Nature · Published 3 October 2026 Swipe more like this →

In short: Originating on the Isle of Man, the Manx cat is famous for its missing tail and rabbit-like gait. While this trait defines the breed, it is caused by a dominant gene that, when inherited from both parents, can lead to severe and sometimes lethal spinal deformities in kittens.

The Manx cat, historically known as the Manks, is a domestic breed defined by a spontaneous spinal mutation. This dominant gene results in varying tail lengths, ranging from the completely tailless 'rumpy' to the 'longy', which possesses a full tail. Because the gene is dominant, breeders must carefully manage pairings; attempting to force the tailless trait by breeding two tailless cats together often results in fatal health complications. Consequently, longer-tailed cats of purebred Manx ancestry remain essential to the breed's survival, serving as vital breeding stock to avoid these deformities.

The breed's unique appearance—featuring elongated hind legs, a rounded head, and a humped silhouette—has inspired centuries of folklore. Tales once claimed the cats were hybrids of rabbits or survivors of a Spanish Armada shipwreck, though these myths are genetically impossible. In reality, the Manx is descended from mainland stock, likely influenced by the limited genetic diversity of island biogeography, a classic example of the founder effect. While they are skilled hunters and were historically prized as ship's cats, their temperament is described as sociable and active.

Exhibited in shows since the 1800s, the Manx was one of the first breeds recognized by the Cat Fanciers' Association in 1908. Early standards were informal, such as the one published by Charles Henry Lane in 1903. Today, the breed's classification remains complex; some registries treat long-haired variants, known as the Cymric, as a separate breed, while others categorize them as a variety of Manx. Despite their lack of a tail, Manx cats maintain excellent balance, as this function is controlled by the inner ear rather than the tail itself.

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