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Tortoiseshell cat

A short-haired black tortoiseshell cat

Tortoiseshell is a cat coat coloring named for its similarity to tortoiseshell pattern. Like tortoiseshell-and-white or calico cats, tortoiseshell cats are almost exclusively female.[1][2][3][4] Male tortoiseshells are rare and are usually sterile.[a][6][4]

Tortoiseshell cats, or torties, combine two colors other than white, either closely mixed or in larger patches.[2] The colors are often described as red and black, but the "red" patches can instead be orange, yellow, or cream,[2] and the "black" can instead be chocolate, gray, tabby, or blue.[2] Tortoiseshell cats with the tabby pattern as one of their colors are sometimes referred to as torbies or torbie cats.[7]

"Tortoiseshell" is typically reserved for multicolored cats with relatively small or no white markings. Those that are predominantly white with tortoiseshell patches are described as tricolor,[2] tortoiseshell-and-white, or calico (in Canada and the United States).[8]

Tortoiseshell markings appear in many different breeds, as well as in non-purebred domestic cats.[8] This pattern is especially preferred in the Japanese Bobtail breed,[9] and exists in the Cornish Rex group.[10]

  1. ^ Centerwall, W. R.; Benirschke, K. (1975). "An animal model for the XXY Klinefelter's syndrome in man: Tortoiseshell and calico male cats". American Journal of Veterinary Research. 36 (9): 1275–1280. PMID 1163864.
  2. ^ a b c d e Centerwall, W. R.; Benirschke, K. (1973). "Male Tortoiseshell and Calico (T-C) Cats: Animal models of sex chromosome mosaics, aneuploids, polyploids, and chimerics". Journal of Heredity. 64 (5): 272–278. doi:10.1093/oxfordjournals.jhered.a108410. PMID 4798734.
  3. ^ Atkins (2003), p. 61
  4. ^ a b Noli, Chiara; Colombo, Silvia (2020). Feline Dermatology. Cham, Switzerland: Springer. ISBN 9783030298364. OCLC 1159164563.
  5. ^ Carver, Leslie. "Characteristics of Tortoiseshell Cats". The Nest. Retrieved 19 December 2015.
  6. ^ Atkins (2003), p.105
  7. ^ "Torbie Cat Breed Facts and Information". Pet Haver. 25 April 2021. Retrieved 26 April 2021.
  8. ^ a b Syufy, Franny. "More Cat Color Patterns: Calicos, Tortoiseshell, Tuxedo Cats". Retrieved 22 January 2009.
  9. ^ "Breed Profile: Japanese Bobtail". Cat Fancier's Association. Archived from the original on 12 June 2007. Retrieved 2 June 2007.
  10. ^ Atkins (2003), p. 90


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