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About the Cover
Cover: Beginning in late winter, male sage-grouse gather on display grounds (leks) to perform their bizarre courtship displays. Females may choose their mates based on acoustic components of these displays, although little is known about how the sounds are produced. Using a multi-channel array of microphones, A. H. Krakauer, M. Tyrrell, K. Lehmann, N. Losin, F. Goller and G. L. Patricelli (pp. 3719-3727) document a 'two-voiced' system in which males produce two simultaneous and non-harmonically related tones. This previously undescribed acoustic complexity was matched by unexpected vocal tract morphology, indicating that the model of the chicken may not be appropriate for understanding sound production in all game birds. Photo by A. H. Krakauer.
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