Fig. 1

Species range map and location of the Aphelocoma jay hybrid zone. a Range of A. californica (gray) and A. woodhouseii (blue). b Inset of sampling sites in the hybrid zone (sites 1 and 8 on the ends of the hybrid cline are not depicted in the inset). Map modified from McCormack et al. [29] with permission and bird illustrations reproduced by permission of Lynx Edicions as they appear in Handbook of the Birds of the World Alive [30]