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References

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    Araya-Salas, M. (2012) Is birdsong music? Evaluating harmonic intervals in songs of a Neotropical songbird. Animal Behaviour, 84, 309313.
  • 2
    Baptista, L. F. and Keister, R. A. (2005) Why birdsong is sometimes like music. Perspectives in Biology and Medicine, 48, 426443.
  • 3
    Saunders, A. A. (1959) Octaves and kilocycles in bird songs. Wilson Bulletin, 71, 280282.
  • 4
    Borror, D. J. and Reese, C. R. (1956) Vocal gymnastics in wood thrush songs. Ohio Journal of Science, 56, 177182.
  • 5
    Hartshorne, C. (1973) Born to Sing. Bloomington : Indiana University Press.
  • 6
    Wing, L. (1951) Notes on the song-series of a hermit thrush in the Yukon. Auk, 68, 189193.
  • 7
    Darwin, C. (1871) The Descent of Man and Selection in Relation to Sex. London : J. Murray.