A class of chaotic bird calls?
Evidence is presented that the basic vocalized sound produced by some cockatoos, specifically the Australian sulfur-crested cockatoo (Cacatua galerita) and the gang-gang cockatoo (Callocephalon fimbriatum), has a chaotic acoustic structure rather than the harmonic structure characteristic of most birdsongs. These findings support those of Fee et al. [Nature (London) 395(3), 67-71 (1999)] on nonlinear period-doubling transitions in the song of the zebra finch (Taeniopygia guttata). It is suggested that syllables with chaotic structure may be a feature of the songs of many birds.
Fletcher
N H
NH
School of Aerospace and Mechanical Engineering, Australian Defence Force Academy, Canberra, Australia.
D000818:Animals; D001717:Birds / Q000502:physiology; D013018:Sound Spectrography; D014828:Vocalization, Animal / Q000502:physiology*