DNA Barcoding in Birds Figure 1. K2P pairwise distances in (a) cox1, (b) cob, and (c) 16S genes. Black bars are comparisons among intraspecific sequences (left axis) and grey bars represent comparisons among different species (right axis). doi:10.1371/journal.pone.0004119.g001 PLoS ONE | www.plosone.org 3 January 2009 | Volume 4 | Issue 1 | e4119