Symmetrical location of White Stork Ciconia ciconia nests in hightension poles


  • Antonio Lima-De-Faria Institute of Genetics, University of Lund



breeding biology, nest site selection, nest density, behaviour, Portugal


The white stork Ciconia ciconia was found to build 24 nests on high-tension poles located in marshy fields near the city of Coimbra, Portugal. The metal poles consist of a central frame with three platforms, which ramifies into two arms in nearly vertical position. These arms are connected by a large horizontal frame. The nests were only situated on the high-tension poles. The number of nests in a single pole was found to be: 1, 2, 5, 6 or 7. In most cases the nests were located at the extreme ends of the metal frames whether these had a horizontal or a nearly vertical position. When two or more nests were present, a symmetrical pattern emerged in all cases observed, irrespective of the different nest locations. Four factors are considered when interpreting these findings: (1) The shape of the poles, (2) the size of the stork’s wings, (3) the presence of a high magnetic field, and (4) the mental behaviour of the birds. The last aspect seems to be the most probable explanation but it demands further study.


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How to Cite

Lima-De-Faria, A. (1999). Symmetrical location of White Stork Ciconia ciconia nests in hightension poles. Ornis Svecica, 9(3), 121–125.



Research Papers