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. 2010 Jun 9;277(1699):3469–3475. doi: 10.1098/rspb.2010.0811

Figure 2.

Figure 2.

Brain volumes of chickens and quail plotted against age expressed as a percentage of normal incubation period. By 19% of incubation, the chicken brain is already more than twice as big as the incubation-matched quail brain. The species difference in brain size persists throughout embryonic development. Diamonds, chicken; filled circles, quail.