Contact calls are used for individual mate recognition in free-ranging green-rumped parrotlets, Forpus passerinus 

@article{Berg2011ContactCA,
  title={Contact calls are used for individual mate recognition in free-ranging green-rumped parrotlets, Forpus passerinus
},
  author={Karl S Berg and Soraya Delgado and Rae Okawa and Steven R. Beissinger and Jack W. Bradbury},
  journal={Animal Behaviour},
  year={2011},
  volume={81},
  pages={241-248}
}
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