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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The social behaviour of the Common Buzzard
Auteurs :	Robin J. Prytherch, Auteur
Type de document :	Article
Dans :	British Birds (102(5) MAY 2009)
Article en page(s) :	247-273
Résumé :	During a long-term study of the Common Buzzard Buteo buteo in Avon, special emphasis was placed on social behaviour. This is shown to be more complex than previously thought, with several new behaviours being described. Furthermore, flight behaviours are shown to be distinctive for the two components of a resident population: territorial pairs and unpaired (non-breeding), mostly one- to three-year-old birds. Buzzards defend their territories from intruding birds by using assertive postures initially. If necessary, further, more demonstrative, behaviours are directed at intruders. These behaviours help the birds to avoid fighting, but this does happen rarely. These and other behaviours serve to advertise the presence of a pair in a territory and are important in pair-bonding. For breeding pairs, activity is normally restricted to the territory, but some males engage in extra-territorial chases, which may involve a form of reciprocal altruism. Some unpaired young birds defend territories, but do not use the full repertoire of behaviours. Some aspects of pair formation and relations within the family group are described, as well as perched postures. The behaviour of juveniles is distinctive especially with regard to play, an activity that can be easily confused with adult behaviours. A few exceptions are described. Suggestions for the origins of the displays are made.

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