“The sight of a feather in a peacock’s tail, whenever I gaze at it, makes me sick!”
Charles Darwin (1809–1882) British naturalist, author of "On the origin of species, by means of natural selection"
Letter https://www.darwinproject.ac.uk/letter/DCP-LETT-2743.xml to Asa Gray, 3 April 1860 <br class="br">Other letters, notebooks, journal articles, recollected statements