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Greater (Tympanuchus cupido) and Lesser (T. pallidicinctus) Prairie-Chicken are thought to be historically and presently allopatric. We documented an area of approximately 250 000 ha in western Kansas characterized by leks with displaying males of both species. Display booms unlike typical Greater or Lesser Prairie-Chickens were heard and recorded at nine mixed leks. Spectrograms of these vocalizations contained elements of Greater and Lesser Prairie-Chicken booms, and comparisons suggested intermediate similarity. Males giving these booms had additional novel characters as well as novel combinations of Greater and Lesser Prairie-Chicken characters, and might represent the first case of hybridization in the wild. Despliegues de Híbridos Aparentes de Tympanuchus en una Zona de Simpatría Resumen. Aunque se ha pensado que Tympanuchus cupido y T. pallidicinctus son especies histórica y actualmente alopátricas, documentamos un área de aproximadamente 250 000 ha en el oeste de Kansas que está caracterizada por asambleas de cortejo integradas por machos de ambas especies. Escuchamos y grabamos vocalizaciones de despliegue diferentes de las típicas de T. cupido y T. pallidicinctus en nueve asambleas de cortejo mixtas. Los espectrogramas de dichas vocalizaciones contenían elementos de los cantos de T. cupido y T. pallidicinctus y presentaban similitud intermedia. Los machos que emitieron esas vocalizaciones presentaban caracteres adicionales novedosos, así como nuevas combinaciones de caracteres de T. cupido y T. pallidicinctus. Éste podría representar el primer caso de hibridación de estas dos especies en condiciones naturales.

Display by Apparent Hybrid Prairie-Chickens in a Zone of Geographic Overlap