Resumen de Anisorrectricilia en el Pinsà Fringilla coelebs
The occurrence of anisorectricyly in the Chaffinch is quantified. From 1985 to 1991 a total of 1.800 birds, trapped in Osona (Catalonia, NE Spain) were examined. Four birds presented 13 rectrices and one bird presented 11 of them, which gives a percentage of occurrence of 0.28 %.
