Age and Sex Determination of Monomorphic Non-breeding Choughs : a Long-term Study

  • Guillermo Blanco, JOSE L. TELLA Estaci, DETERMINACION DE LA EDAD Y EL SEXO EN CHOVAS PIQUIRROJAS PYRRHOCORAX PYRRttOCORAX NO REPRODUCTORAS
  • Published 2004
--We present criteria for sexing and aging non-breeding Choughs (Pyrrhocorax pyrrhocorax) based on nine years of capture-recapture data. Shape of the rectrices, intensity of plumage colour and iridescent brightness, and the contrast between old flight feathers and freshly molted ones allowed us to distinguish three age classes (first-year, second-year, and… (More)