Ecology: Birds sing at a higher pitch in urban noise

@article{Slabbekoorn2003EcologyBS,
  title={Ecology: Birds sing at a higher pitch in urban noise},
  author={Hans Slabbekoorn and M. Peet},
  journal={Nature},
  year={2003},
  volume={424},
  pages={267-267}
}
Great tits hit the high notes to ensure that their mating calls are heard above the city's din. 

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