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Résumé :
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Various aspects of the breeding biology of the Wallcreeper were studied in the Velka and Mala Fatra Mts. (Slovakia) during 1982-2000. Individual colour-ringing was used to study site and mate fidelity on the breeding grounds. A high degree of site fidelity of pairs to the breeding localities and juveniles to the birthplaces (natal philopatry) was found. A remarkable degree of mate fidelity was also recorded. Successful breeding of very close relatives (father with daughter and brother with sister) was proven at two remote localities where solitary pairs bred in 1997, 1998, 1999, and 2000. I propose that partners of solitary pairs in localities remote from other breeding locations could be members of a single family which may be unaware of any other neighbouring pairs. This hypothesis may be tested by further research based on colour-ringing of a sufficiently large sample of birds.
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