在隔了一年後，馬什重新組織了考古團隊再次回到堪薩斯州，這次由馬什的學生Thomas H. Russell發現到了接近完整的黃昏鳥化石。[10]這具樣本上完整地保留了黃昏鳥的頭部，讓馬什驚訝的是，黃昏鳥的口中上下均具有牙齒。[11]在1873年，馬什表示這些化石的發現，模糊了分隔鳥類與爬蟲類的界線。[11]然而之後不久，部分挖掘到的化石樣本卻流到了愛德華·德林克·科普手上，成為引發「化石戰爭」的導火線。
Perrins, Christopher. Harrison, C.J.O. , 編. Birds: Their Life, Their Ways, Their World. Pleasantville, NY, US: Reader's Digest Association, Inc. 1987: 165–166 [1979]. ISBN 0895770652.
Holtz, Thomas R. Jr. (2011) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages,Winter 2010 Appendix. （頁面存檔備份，存於互聯網檔案館）
Charles Schuchert and Clara Mae LeVene, O.C. Marsh: Pioneer in Paleontology, p. 427. New York: Arno Press, 1978. Later, Russell assisted Marsh while attending medical school; he became a surgeon, professor of Clinical Surgery in the Yale School of Medicine, and Marsh's personal physician until Marsh's death in 1899. See Proceedings of the Connecticut State Medical Society (Google eBook) and Genealogical and Family History of the State of Connecticut: A Record of the Achievements of Her People in the Making of a Commonwealth and the Founding of a Nation. Editorial staff: William Richard Cutter, Edward Henry Clement, Samuel Hart, Mary Kingsbury Talcott, Frederick Bostwick, Ezra Scollay Stearns. Volume I (of 4). New York: Lewis Historical Publishing Company, 1911.
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