Figure 8
From: Beak and skull shapes of human commensal and non-commensal house sparrows Passer domesticus
Photograph (dorsal view) of a non-commensal house sparrow P. d bactrianus (upper panel) and a similar sized commensal house sparrow P. d. persicus (lower panel). Notice the difference in robustness and elongation of the facial cranium, and in particular a) the postorbital process, b) the lachrymal process, c) the oral surface of the maxillare as seen through the nostrils, d) the nasal process and e) the occipital region.