Figures illustrating various color-markings on bird feathers from <a href="https://en.wikipedia.org/wiki/Robert_Ridgway" class="extiw" title="w:Robert Ridgway">Robert Ridgway</a> (1886) <cite>A Nomenclature of Colors for Naturalists, and Compendium of Useful Knowledge for Ornithologists</cite>, Boston, Mass.: <a href="https://en.wikipedia.org/wiki/Little,_Brown_and_Company" class="extiw" title="w:Little, Brown and Company">Little, Brown, and Company</a>, <small><a href="https://en.wikipedia.org/wiki/OCLC" class="extiw" title="w:OCLC">OCLC</a> <a rel="nofollow" class="external text" href="https://worldcat.org/oclc/1027257614">1027257614</a></small>, <a rel="nofollow" class="external text" href="https://archive.org/details/nomenclatureofco00ridg/page/n186/mode/1up">plate XV</a>.
<bdi><a href="https://en.wikipedia.org/wiki/en:John_L._Ridgway" class="extiw" title="w:en:John L. Ridgway"><span title="American ornithologist">John L. Ridgway</span></a>
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