Waterfowl-two-goose-species

Most common breeds of domestic geese descend from the European Graylag (Anser anser)—represented on the right by a Buff Pomeranian goose (female). Descendents of the Asian Swan goose (Anser cygnoides) are distinguished by a prominent black knob where the upper bill meets the skull—represented on the left by an African gander (male).

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