La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Post-nestling dependence period in the Bonelli's Eagle Hieraaetus fasciatus
Auteurs :	J. Real, Auteur ; S. Manosa, Auteur ; J. Codina, Auteur
Type de document :	Article
Dans :	Ornis Fennica (75(3) 1998)
Article en page(s) :	129-137
Langues:	Anglais
Résumé :	The behaviour of five young Bonelli's Eagle Hieraaetus fasciatus was monitored from leaving the nest to dispersal in 1987 in three breeding sites in Catalonia (NE Spain), by means of radio-tracking techniques. On average, the young left the nests 63 days after hatching. The acquisition of flying ability was progressive, and was complete about 40-60 days after leaving the nest. The length of the dependence period (from leaving the nest to the end of parental food delivery) was 57-95 days. All the young suddenly left the natal area some days (11-36 days) after the last parental prey delivery was observed. The length of the post-nestling period (from leaving the nest to dispersal) was 77-113 days. Transition to independence involved a decline in parental investment. During the post-nestling period, some young were recorded up to 8.3 km away from the nest. A return of one young to its natal area three months after dispersal was also recorded.

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