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ACKNOWLEDGMENTS
We would like to thank P.A. Holroyd at the University of California Museum of Paleontology; T.A. Deméré, San Diego Museum of Natural History; S.A. McLeod, Natural History Museum of Los Angeles County; R. Hulbert, Florida Museum of Natural History; and M. Brett-Surman, United States National Museum who all provided data on the cetaceans in their collections management databases. N.D.P. would like to thank A.B. Barnosky, E.B. Davis, P.A. Holroyd, D.R. Lindberg, and G.P. Wilson for comments on early drafts. Insightful and constructive comments from two anonymous reviewers greatly improved the quality of this manuscript. This research was supported by a grant from the UCMP Remington Kellogg Fund and the NSF Graduate Research Fellowship (both to N.D.P.). This paper is UCMP Contribution No. 1862 and PBDB contribution number 65.
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