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Subspecies
Many Subspecies are indistinctive from the other(s) or very slight differences. But many appear to be very area specific either in their breeding or wintering area. There are some really good subspecies guides and they are linked in. Sibley Guides are very good for North America species, Cornell Labs give good descriptions on appearance as well as locations. also are included some of the US state pages for identification. they are really good from Washington for the western canada and cackling geese.
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