Figure 4 from: Vázquez-López M, Morrone JJ, Ramírez-Barrera SM, López-López A, Robles-Bello SM, Hernández-Baños BE (2020) Multilocus, phenotypic, behavioral, and ecological niche analyses provide evidence for two species within Euphonia affinis (Aves, Fringillidae). ZooKeys 952: 129-157. https://doi.org/10.3897/zookeys.952.51785

Figure 4 Vocalization analysis. Boxplot of note emission rate A and PCA of measured vocal characters B Calls differ between the two groups in temporal structure, but not in frequency or number of notes.