@misc{indiciae9045bcfcca1d,
  title = {Concern is more than just 'ruffled feathers'.},
  author = {Kai M A Chan and Stephen Porder and Paul A T Higgins and Sasha B Kramer},
  year = {2004},
  doi = {10.1038/428255a},
  url = {https://pubmed.ncbi.nlm.nih.gov/15029167/},
  note = {Source identifier: 15029167}
}