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Birds Of The World: Cnemiornis True Geese Coscoroba Gray-lag Goose The White-fronted Goose Geese - Other Species The Ducks Black-bellied Tree-duck Shelldrakes Shell-ducks Read More Articles About: Birds Of The World |
( Originally Published Early 1900's )
Closely allied to the last, and by some included with them, are the Shell-Ducks (Casarca), of which four species are known, these being widely distributed over the southern parts of the Old World. They are separated mainly on the ground of the dissimilarity of the sexes.
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