Figure 1From: Song characteristics track bill morphology along a gradient of urbanization in house finches (Haemorhous mexicanus) Relationship between (A) the average bill width and length at each of our eight study sites for which we gathered data on bill traits (±SE) and (B) the average bill length and the urbanization PC1 scores at each of our eight study sites for which we gathered data on bill traits (±SE). Back to article page