Acknowledgments

I thank D. Norton for his willingness to share his experiences and ideas about modern polar animal biology. I thank R. Tykoski and B. Hong of the Museum of Nature and Science for preparation of specimens used in this study, and K. Morton, also of the Museum of Nature and Science, for help with illustrations. I thank P. Ungar for providing access to Microware 4.02 and his willingness to share his thoughts and in press manuscript. I thank T. Rowe for access to the collections at the Texas Natural Science Center and L. Ivy for access to specimens at the Denver Museum of Nature and Science. I also thank E. Taylor for bringing to my attention the recent discussion regarding reindeer and circadian rhythms. And I also thank Rep for freely exchanging his thoughts on the paleobiology of Alaskan dinosaurs. I also thank R. Beavers for providing support for the Scanning Electron Microscope component of this study. Two anonymous reviewers provided insightful comments that greatly improved this manuscript. And, I appreciate the help of Dr. Federico Fanti for the Italian translation of my abstract.

The National Science Foundation grant OPP 0424594 and the Jurassic Foundation provided financial support for research on the North Slope. I also gratefully acknowledge the support of the Museum of Nature and Science, American Airlines, Whole Earth Provision Company, Arco Alaska, Inc., Phillips Petroleum, Inc., Alyeska Pipeline Service Company, Inc., and the Arctic Management Unit of the Bureau of Land Management for additional support in the field.

Lastly, this paper is dedicated to C.A. Repenning, first for his contributions to vertebrate paleontology in the northern high latitudes and secondly for being the first person to recognize the significance of Alaskan dinosaurs and starting the rush north for more.