La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Breeding cycle of the Southern Bald Ibis, Geronticus calvus
Auteurs :	G. Kopij, Auteur ; O. B. Kok, Auteur ; R. J. Nuttall, Auteur
Type de document :	Article
Dans :	Ostrich (71(3-4) SEP 2000)
Article en page(s) :	393-399
Langues:	Anglais
Résumé :	The breeding cycle of the Southern Bald Ibis, Geronticus calvus, was studied at a colony In the eastern Free State. Birds were paired before breeding commenced and nest building began regularly two weeks before the first eggs were laid. Nesting material was collected chiefly by the male. Incubation started with the first egg and lasted 26-32 days. Both sexes incubated, the female usually in the morning, the mole around noon, and both sexes in the afternoon. Hatching is asynchronous with intervals between eggs ranging from one id four days. Both parents participate in rearing the young; the female broods more often, while the mole brings the bulk of the food for the nestlings that were fed 3-4 times a day. Strong competition for food between nestlings war recorded. Nestlings remain in nests for at least 35 days.

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