| macrogeographical variation in the song of a widely distributed african warbler. | the songs of oscine passerine birds vary on many spatial scales, reflecting the actions of diverse evolutionary pressures. here we examine the songs of cisticola erythrops, which effectively signal species identity across a geographical area spanning 6500 km in sub-saharan africa. selection for species identification should promote stability in song traits, while sexual selection and geographical segregation should promote diversity. cisticola erythrops share syllable types across the entire ran ... | 2009 | 19443510 |