I thank Cheri Jones of the Denver Museum of Nature and Science for her generous support and help in the acquisition and use of specimens; Elaine Anderson for providing information on and access to Porcupine Cave; Don Rasmussen, Jerry Ras-mussen, Louis Taylor, Bob Raynolds, and the Porcupine Cave volunteers; David Armstrong for his guidance; Russ Graham for providing helpful discussions; Kathy Honda for help with the initial literature search; and John White and Arthur Harris for providing crucial information on leporid morphology. Charles Repenning, H. Thomas Goodwin, A. D. Barnosky, Dennis Ruez Jr., and an anonymous reviewer all provided helpful comments that improved the manuscript.

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