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Article
A. Margalida, Auteur ; J. Bertran, Auteur ; J. Boudet, AuteurWe compared direct observation methods to assess the diet of nestling Bearded Vultures in the Pyrenees northeastern Spain. Using video cameras and telescopes, diet was determined from observations of food items delivered to, and prey remains in,[...]
Article
J. Bertran, Auteur ; A. Margalida, AuteurMale-male mountings appear to be very common in polyandrous bearded vulture Gypaetetus barbatus trios. We observed sexual activity in two trios that occupied the same territory in different years. We recorded a total of 167 copulation attempts. [...]
Article
A. Margalida, Auteur ; J. Bertran, AuteurDans Ardea (88(2) 2000)Bearded Vultures Gypaetus barbatus began supplying material to their nests on average 111 d (range 91-126 d) prior to laying. Males were significantly more active that females. Heavy material (branches) was transported indistinctly in the talons[...]
Article
A. Margalida, Auteur ; S. Ecolan, Auteur ; J. Boudet, Auteur ; J. Bertran, Auteur ; J. M. Martinez, Auteur ; R. Heredia, AuteurWe designed a system of solar-powered video cameras that transmitted images via telemetry to a monitor. This system allowed us to study the breeding behavior of the Bearded Vulture (Gypaetus barbatus) in the Pyrenees (northeastern Spain). From 2[...]
Article
J. Bertran, Auteur ; A. Margalida, AuteurGriffon Vultures (Gyps fulvus) are responsible for most eases of usurpation of nests of Bearded Vultures (Gypaetus barbatus). However, little is known about how both species interact during reproduction. We studied territorial behaviour during t[...]
