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'''Calico''' or '''tortoiseshell''' is a type of coloring found on [[cat]]s, usually a combination of red, black, chocolate and cinnamon. The color pattern is caused by a genetic trait called X-inactivation or lyonization.

== External links ==
* [http://messybeast.com/tricolours.htm Tortoiseshell and Tri-Color Cats]

[[Category:Biology]]