Sample recording of black-chinned hummingbird vocalizations. See  Fig. 3(C)  in main text for spectrogram.
Francis C, Ortega C, Cruz A
CC BY 2.5
Audio S3 from <cite style="font-style:normal">Francis C, Ortega C, Cruz A (2011). "<a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3212537">Noise Pollution Filters Bird Communities Based on Vocal Frequency</a>". <i>PLOS ONE</i>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1371/journal.pone.0027052">10.1371/journal.pone.0027052</a>. <a href="https://en.wikipedia.org/wiki/PMID" class="extiw" title="w:PMID">PMID</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pubmed/22096517">22096517</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" class="extiw" title="w:PubMed Central">PMC</a>: <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3212537">3212537</a>.</cite>