Distress call in six species of African Poicephalus parrots

@article{Venuto2001DistressCI,
  title={Distress call in six species of African Poicephalus parrots},
  author={Vincenzo Venuto and V. Ferraiuolo and Luciana Bottoni and R. Massa},
  journal={Ethology Ecology & Evolution},
  year={2001},
  volume={13},
  pages={49-68}
}