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Audubon (1842) provided extensive anatomical description of the head and hyoid of the Ivory-billed, including exquisite drawings of the dissected gut and head. An Ivory-billed hyoid on a juvenile female in the collection of the Bell Museum of Natural History, University of Minnesota (Mus. Zool. Surv. Minn. #4188) has a bony tip that is 7 mm long.
Jackson, Jerome A. 2002. Ivory-billed Woodpecker (Campephilus principalis), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/711
