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C. R. Friesen, Powers, D. R., and Mason, R. T., Cost of male courtship: Using whole group metabolic rate to assess cost of courtship, Integrative and Comparative Biology, vol. 49, pp. E230-E230, 2009.
B. W. Tobalske, Hedrick, T. L., Biewener, A. A., Warrick, D. R., and Powers, D. R., Effects of flight speed upon muscle activity and metabolic rate in hummingbirds, Comparative Biochemistry and Physiology a-Molecular & Integrative Physiology, vol. 153A, pp. S122-S122, 2009.
D. R. Warrick, Tobalske, B. W., and Powers, D. R., Lift production in the hovering hummingbird, Proceedings of the Royal Society B-Biological Sciences, vol. 276, pp. 3747-3752, 2009.