Fig. 2From: Comparison of head size and bite force in two sister species of parrotbillsThe distribution ranges and sampling sites of two sister species of parrotbills in this study. For Vinous-throated Parrotbills, three geographic populations were sampled, including Guizhou, Jiangxi and Hebei whilst for Ashy-throated Parrotbills the Guizhou population was sampledBack to article page