ABSTRACT During June-July 1997, five colonies of Brent Geese Branta bernicla were visited in northwest Yakutia, East Siberia: three (total about 132 pairs) in the Olenyok delta and two (22 pairs) in the western Lena delta. Colonies varied in size from ten to 90 pairs. At all sites, both the nominate race bernicla and the race nigricans were found, the proportion of nominate varying from 15% in the


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