No tots els Bruels (Regulus ignicapillus) amb rectrius estretes i punxegudes són juvenils

• Autores: Lluís Gustamante
• Localización: Butlletí del Grup Català d'Anellament, ISSN 1130-2070, Vol. 7, Nº. 1, 1990, págs. 9-10
• Idioma: catalán
• Enlaces
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• Resumen

  • An adult Firecrest, previously ringed on 23.12.89 wos recaptured on 14.1 O. 90 presenting new tail feathers which were narrow and pointed. This shows that some adult Firecrests may retain juvenile characteristics, leading to the incorrect ageing of some birds.