Birds may pitch songs to win mates despite urban din.
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References
Slabbekoorn, H. & Peet, M. Birds sing at a higher pitch in urban noise. Nature, 424, 267, (2003).
Slabbekoorn, H. & Smith, T. B. Habitat-dependent song divergence in the little greenbul: an analysis of environmental selection pressures on acoustic signals. Evolution, 56, 1849 - 1858, (2002).
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University of Copenhagen
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Hopkin, M. City tits hit the high notes to beat traffic hum. Nature (2003). https://doi.org/10.1038/news030714-10
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DOI: https://doi.org/10.1038/news030714-10