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Stegosaurus had a brain that weighed about 2.8 oz, the same as a dog's brain. That is very small considering that the Stegosaurus was 30 feet long and weighed 5.5 tons. People often say that its brain was the size of a walnut or a pea, but that exaggerates its small size.

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11y ago
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13y ago

The size of a brain of a stegosaurus was about the same size as a walnut.

First answer: you are joking, right? oh, whatever. a stegosaur brain is only as big as a walnut

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13y ago

The size of a walnut (approximately)

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13y ago

The size of a peanut

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