Acknowledgments

We thank J. Sadd, M. Lacy, S. Meiri, D. Polly, and D. Cope for advice regarding the statistical portion of this project. We thank G. Gage for her help with measuring Camelops astragali and A. Sutyagina for helping with measurements of the felids. We thank C. Shaw and J. Harris for access to the Page Museum collections, and X. Wang and L. Barnes for access to the San Josecito Cave specimens stored in the Natural History Museum of Los Angeles County. We thank A. Clifford for his suggestions, and B.L. Beatty, D. Cope, M. Lacy, S. Meiri, D. Polly, and an anonymous reviewer for helpful comments on the manuscript. Prothero is grateful to the late Howard Levene, who taught him biostatistics at Columbia University in the late 1970s and provided a link to Dobzhansky and other great scientists of the twentieth century.