Finding a parent in a king penguin colony: the acoustic system of individual recognition

@article{Jouventin1999FindingAP,
  title={Finding a parent in a king penguin colony: the acoustic system of individual recognition},
  author={Pierre JouventinP. Jouventin and Thierry Aubin and Thierry Lengagne},
  journal={Animal Behaviour},
  year={1999},
  volume={57},
  pages={1175-1183}
}
To be fed, a king penguin, Aptenodytes patagonicus, chick must identify the call of its parents, in the continuous background noise of the colony. To study this recognition process, we played back to the chicks parental calls with acoustic parameters modified in the temporal and frequency domains. The parental call is composed of syllables (complex sounds with harmonic series) separated by pronounced amplitude declines. Our experiments with modified signals indicate that the chick's frequency… 
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