Data from: Higher songs of city birds may not be an individual response to noise

Sue Anne Zollinger, Peter J. B. Slater, Erwin Nemeth & Henrik Brumm
It has been observed in many songbird species that populations in noisy urban areas sing with a higher minimum frequency than do matched populations in quieter, less developed areas. However, why and how this divergence occurs is not yet understood. We experimentally tested whether chronic noise exposure during vocal learning results in songs with higher minimum frequencies in great tits (Parus major), the first species for which a correlation between anthropogenic noise and song frequency...
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