A bird hybrid is a bird that has two different species as parents. The resulting bird can present with any combination of characters from the parent species, from totally identical to completely different. Usually, the bird hybrid shows intermediate characteristics between the two species. A "successful" hybrid is one demonstrated to produce fertile offspring.
Numerous gamebird, domestic fowl and duck hybrids are known. About 16% of all bird species have hybridized with at least one other species and this number increases to 22% when captive hybrids are taken into account. The scientific literature on hybridization in birds has been collected at the Avian Hybrids Project.
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