Atlapetes albinucha distribution shown in green stapled lines, based on Sánchez-González et al. (2015) and Natureserve (http://natureserve.org). Blue dots depict tissue samples used in the present study. Red dots depict records of the species used to construct the distribution model. Bird pictures depict the geographic regions where color morphs are found. Blue line depicts the location of the putative distribution barrier of the morphs in Chiapas.