魯爾與萊特的研究被延用了數十年。在70與80年代,Michael K. Brett-Surman在博士畢業研究中重新研究這些鴨嘴龍類化石。他提出鴨龍的模式種(A. annectens)是埃德蒙頓龍的一種,而科氏鴨龍則是獨立的屬[18][19][20]。雖然國際動物命名法委員會(International Commission on Zoological Nomenclature)並不承認畢業論文為正式研究,後來的科學家與論文多採用Brett-Surman的說法[21][22]。在1990年,Ralph Chapman與Brett-Surman正式發表學術研究,將科氏鴨龍建立為新屬,大鴨龍(Anatotitan),模式種是科氏大鴨龍(A. copei)。屬名是由拉丁文的鴨子(anas)與希臘文的泰坦(Titan)組合而成,意為「巨大的鴨子」[6][23]。
在1902年,海徹爾曾提出科氏大鴨龍的標本事實上是個Edmontosaurus annectens,而牠的頭顱骨在化石化期間經已被壓扁,才有現時的長扁外貌。在2004年,傑克·霍納(Jack Horner)、大衛·威顯穆沛(David B . Weishampel)、凱薩琳·福斯特(Catherine Forster)等人再度提出這個說法[9]。
^ 1.01.11.21.3Cope, Edward D. On the characters of the skull in the Hadrosauridae. Proceedings of the Philadelphia Academy of Natural Sciences. 1882, 35: 97–107.
^Lull, Richard Swann; and Wright, Nelda E. Hadrosaurian Dinosaurs of North America. Geological Society of America Special Paper 40. Geological Society of America. 1942: 225.引文使用过时参数coauthors (帮助)
^Sues, Hans-Dieter. Ornithopods. Farlow, James O., and Brett-Surman, Michael K. (eds.) (编). The Complete Dinosaur. Bloomington: Indiana University Press. 1997: 338. ISBN 0-253-33349-0.
^ 6.06.16.26.3Chapman, Ralph E.; and Brett-Surman, Michael K. Morphometric observations on hadrosaurid ornithopods. Carpenter, Kenneth, and Currie, Philip J. (eds.) (编). Dinosaur Systematics: Perspectives and Approaches. Cambridge: Cambridge University Press. 1990: 163–177. ISBN 0-521-43810-1.引文使用过时参数coauthors (帮助)
^ 7.07.17.27.3Lull and Wright, Hadrosaurian Dinosaurs of North America, pp. 157-159.
^ 8.08.18.2Lull and Wright, Hadrosaurian Dinosaurs of North America, pp. 163-164.
^ 9.09.19.29.3Horner, John R.; Weishampel, David B.; and Forster, Catherine A. Hadrosauridae. Weishampel, David B.; Osmólska, Halszka; and Dodson, Peter (eds.) (编). The Dinosauria 2nd. Berkeley: University of California Press. 2004: 438–463. ISBN 0-520-24209-2.引文使用过时参数coauthors (帮助)
^ 11.011.111.2Creisler, Benjamin S. Deciphering duckbills: a history in nomenclature. Carpenter, Kenneth (ed.) (编). Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Bloomington and Indianapolis: Indiana University Press. 2007: 185–210. ISBN 0-253-34817-X.
^ 12.012.1Ostrom, John H. A reconsideration of the paleoecology of the hadrosaurian dinosaurs. American Journal of Science: 975–997.
^Marsh, Othniel C. The skull and brain of Claosaurus. American Journal of Science, 3rd series. 1893, 45: 83–86.
^Lull and Wright, Hadrosaurian Dinosaurs of North America, pp. 43.
^Lull and Wright, Hadrosaurian Dinosaurs of North America, pp. 154-164.
^Brett-Surman, Michael K. The appendicular anatomy of hadrosaurian dinosaurs. M.A. thesis. Berkeley: University of California. 1975.
^Brett-Surman, Michael K. Phylogeny and paleobiogeography of hadrosaurian dinosaurs. Nature. 1979, 277 (5697): 560–562.
^Brett-Surman, Michael K. A revision of the Hadrosauridae (Reptilia: Ornithischia) and their evolution during the Campanian and Maastrichtian. Ph.D. dissertation. Washington, D.C.: George Washington University. 1989.
^Marsh, Othniel C. Additional characteristics of the Ceratopsidae, with notice of new Cretaceous dinosaurs. American Journal of Science, 3rd series. 1890, 39: 418–426.
^Olshevsky, George. A Revision of the Parainfraclass Archosauria Cope, 1869, Excluding the Advanced Crocodylia.. Mesozoic Meanderings No. 2. San Diego: Publications Requiring Research. 1991: 196pp.
^Russell, Dale A. An Odyssey in Time: Dinosaurs of North America. Minocqua, Wisconsin: NorthWord Press, Inc. 1989: 175–176. ISBN 1-55971-038-1.
^Weishampel, David B.; Barrett, Paul M.; Coria, Rodolfo A.; Le Loeuff, Jean; Xu Xing; Zhao Xijin; Sahni, Ashok; Gomani, Elizabeth, M.P.; and Noto, Christopher R. (2004). "Dinosaur Distribution". The Dinosauria (2nd). 517–606.