Seasonal patterns of age and sex ratios, morphology and body mass of Bramblings Fringilla montifringilla at a large winter roost in southern Europe

During the winter, Bramblings Fringilla montifringilla are known for concentrating in huge communal roosts, normally situated along a NE-SW axis from west Russia to France in southern Europe. Irruptions of Bramblings in Iberia are rare and normally only in an attenuated form. Exceptionally, in Novem...

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