Figure 3From: Geographic variation in sexual selection and implications for speciation in the Barn Swallow Major clades within the barn swallow complex. The splits between African and Europe (V1), Europe and Asia (V2), and Asia and North America (V3) likely arose via vicariance events, whereas the split between North America and the Baikal region (D) is likely due to dispersal of North American birds into Eastern Russia. Figure modified from Zink et al. ([2006]).Back to article page