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Providing evidence to improve practice

Individual study: Effect of supplementary food provision on survival of bearded vulture Gypaetus barbatus chicks in the Pyrenees, north-eastern Spain

Published source details

Margalida A., Garca D., Heredia R. & Bertran J. (2009) Video-monitoring helps to optimize the rescue of second-hatched chicks in the endangered bearded vulture Gypaetus barbatus. Bird Conservation International, 20, 55-61


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Provide supplementary food to allow the rescue of a second chick Bird Conservation

A small controlled study in the Spanish Pyrenees in spring 2004-5 and 2008 (Margalida et al. 2009) found that second-hatched lammergeier (bearded vulture) Gypaetus barbatus chicks from two nests provided with supplementary food survived for nine days, as opposed to seven, five and four days for a partially-supplemented nest and two control (unfed) nests, respectively. In a third supplemented nest (in 2008), the second-hatched chick survived for five days and was removed to be hand-reared and incorporated into a captive-breeding programme. Supplementary food consisted of 2-3 kg of dead rabbits within 100 m of the nests every two days from the hatching of the first chick until the death (or removal) of the second chick. The partially-supplemented nest was provided with food on just one day.