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Résumé :
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Juvenile Ural Owls Strix uralensis reintroduced in the National Park Bayerischer Wald need supplementary food offered close to the "release-enclosures" to get through the first time of their lives in freedom. Already resident free-living breeding pairs have access to this offered food, too, and use it increasingly when food supply is poor. The influence of supplementary food is already evident in the expansion of the home range, but especially so in the food composition and, related to it, in the breeding success of these Ural Owl pairs.
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