Mystery Bird: Barnacle Goose, Branta leucopsis

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[Mystery bird] Barnacle Goose, Branta leucopsis, photographed at Luonnontieteellinen keskusmuseo (University of Helsinki Museum of Natural History), Helsinki, Finland. [picture of the same species with its muscle and feathers]
Image: GrrlScientist, 18 May 2010 [larger view]
Canon SX100 IS.

Please name at least one field mark that supports your identification.

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