Hazel Grouse in the Pyrenees. Since the French breeding bird atlas (Yeatman 1976), the Hazel Grouse Bonasa bonasia has been considered nonexistent in the Pyrenees (Elosegui 1985; CROAP 1987). It is true, however, that its secretive nature and habitat preference make it difficult to observe. In spite of this negative general belief, a survey was started in 1976. All information and reported si


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