The ancestors of the domestic goose are derived from two distinct wild species. Western (European) breeds have been developed from the greylag, and Asiatic breeds such as the African and Chinese from the swan goose. Despite their separate origin, the Asiatics and greylag types do inter-breed.
Crosses of the Asian and European types have produced distinctive breeds of Russian geese such as the Tula, Arsamas and Kholmogory, plus the beautiful blue German Steinbacher.
Steinbacher goose - a Eurasian cross