During 1971-76 the world population of the Dark-bellied Brent Goose Branta bernicla bemicla has more than trebled, while in the period since the first attempt at assessing the size of the population (1955-57) it has increased nearly sixfold. It has managed this at a time when biologists were predicting that food supplies were holding its numbers at the earlier low level, when conservationists were


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