Syroechkovski et al. (1998) have recently published the results of a study of Brent Geese Branta bernicla in northwest Yakutia, Russia. They claimed to have located a previously unknown contact zone of Dark-bellied Brent Goose Branta (b.) bernicla and Black Brant B. (b.) nigricans. If valid, these observations would be significant because they would provide the first documentation of the interacti


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