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. 2015 Jun 5;229(2):239–251. doi: 10.1111/joa.12325

Figure 6.

Figure 6

Principle component (PC) analysis of the brain shape of parrots. (A) Plot of PC1 against PC2. (B) Brain shape variation along PC1 and PC2 axis. Solid dots indicate Macaws and allies; inverted solid triangles indicate Amazons and allies; and solid squares indicate cockatoos, according to Tavares et al. (2006).