Figure 6.

Graphical summary of two sample t tests for the skull shape comparisons taking allometric effects into account. Each surface representation is based on the following formula: (the allometric expectation predicted from the all‐specimen mean of centroid size) + 3 × [residual means of the focal population with significant differences from the counterpart (p < 0.025)]. (a) Comparisons of the large‐billed crow (right) and carrion crow (left) in sympatry. Upper and lower drawings represent the skull in oblique front and right lateral views, respectively. (b) Comparisons of the sympatric (right) and allopatric (left) populations of the large‐billed crow. Upper and lower drawings represent the skull in oblique front and right lateral views, respectively