From The Art and Popular Culture Encyclopedia
A crossbreed or crossbred is a hybrid animal of two purebred parents. Crossbreed may also refer to a domestic animal where the breed status of only one parent or grandparent is known. Crossbreeding, also known as mixing, refers to the process of breeding such an animal, often with the intention of creating offspring that share the traits of both parent lineages. The term is sometimes used for plants but is more commonly applied to domesticated animals.
Crossbreeds in specific animals
The liger is a hybrid cross between a male Panthera leo (lion), and a female Panthera tigris (tiger). A dog of unknown parentage is often called a mongrel, while a cat of unknown parentage is often referred to as a moggy (also moggie). The yattle is a cross between a cow and a yak.