Fig. 3
From: Song divergence indicates an unclear relationship between the Neotropical and Nearctic Horned Larks
Boxplot of the song divergence (PC1) between the Nearctic and Neotropical songs and PC1 vs PC2 scatterplot evaluated in: a the analysis using all retrieved songs, and b the analysis using one song per recording. The ellipses of the scatterplot were calculated automatically in the R software using the option of concentration ellipses (.5.8°). For the Nearctic songs, we show its geographic subclassification: Central-West (CW), North-East (NE), North-West (NW), South-West (SW), and South USA-Mexico (SM). *** = p < 0.001