Seasonal Changes in Nest Site Selection of the Fieldfare Turdus pilaris

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Abstract
In the early parts of the breeding season, a Swiss population of fieldfares T. pilaris showed distinct preferences for conifers as nesting trees. As the foliage developed, deciduous trees became progressively more attractive until coniferous and deciduous nest sites were about equally common. All data come from the same area, i.e., there was no change in the availability of the different types of trees. No differential breeding success could be detected, due to an unusually high level of predation. The seasonal changes in nest site preferences reflect the fieldfares'' attempts to conceal their nest at least to some degree.

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