Birdsong makes best use of forest acoustics.
References
Nemeth, E., Winkler, H. & Dabelsteen, T. . Differential degradation of antbird songs in a Neotropical rainforest: adaptation to perch height? Journal of the Acoustical Society of America 110, 3263 - 3274 (2001).
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University of Cardiff
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Whitfield, J. Perch affects birds' pitch. Nature (2001). https://doi.org/10.1038/news011227-9
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DOI: https://doi.org/10.1038/news011227-9
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