An early mammal from the Triassic period, the Morganucodon's brain was approximately ________ bigger, relative to body size, than the brains of comparable reptiles.

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Morganucodon's brain was approximately 50% bigger, relative to body size, than the brains of comparable reptiles, indicating early signs of the significant brain size increase that characterizes mammals.

An Early Mammal from the Triassic Period, the Morganucodon's Brain