Cohen, Avi: A Comparison of Nursing Activity in Two Domesticated Species of Ungulates: Horse (Equus Caballus) and Sheep (Ovis Aries), 1985, Box: 4. Cornell University Office of Undergraduate Biology honors theses, 53-2-4432. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/919557 Accessed August 26, 2026.