![]() Tortoiseshell and calico coats result from an interaction between genetic and developmental factors. In the course of his studies he discovered that the rare tortoiseshell male is often sterile. Leonard Doncaster was the first to prove that tortoiseshell is the female heterozygote of orange and black, the corresponding male being orange. ( October 2012) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This section needs additional citations for verification. This pattern is especially preferred in the Japanese Bobtail breed, and exists in the Cornish Rex group. Tortoiseshell markings appear in many different breeds, as well as in non-purebred domestic cats. Tortie cats with a predominantly white undercoat are often referred to as "caliby," a portmanteau of "calico" and "tabby." Ĭats with a tortoiseshell pattern and small blotches of white are sometimes referred to as "tortico," a portmanteau of "tortie" and "calico." Those that are predominantly white with tortoiseshell patches are described as tricolor, tortoiseshell-and-white (in the United Kingdom), or calico (in Canada and the United States). "Tortoiseshell" is typically reserved for particolored cats with relatively small or no white markings. ![]() Tortoiseshell cats with the tabby pattern as one of their colors are sometimes referred to as torbies or torbie cats. The colors are often described as red and black, but the "red" patches can instead be orange, yellow, or cream, and the "black" can instead be chocolate, gray, tabby, or blue. Tortoiseshell cats, or torties, combine two colors other than white, either closely mixed or in larger patches. Male tortoiseshells are rare and are usually sterile. Like calicoes, tortoiseshell cats are almost exclusively female. Tortoiseshell is a cat coat coloring named for its similarity to tortoiseshell material.
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