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Did dinosaurs have two brains?

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Sauropods and stegosaurs seemed like the perfect candidates for butt brains. These huge dinosaurs seemed to have pitiful brain sizes compared to the rest of their body, and a second brain–or similar organ–could have helped coordinate their back legs and tails. read more

"Two brains" myth Brain cavity of S. stenops marked with red Soon after describing Stegosaurus, Othniel Charles Marsh noted a large canal in the hip region of the spinal cord, which could have accommodated a structure up to 20 times larger than the famously small brain. read more

For decades, popular articles and books claimed that the armor-plated Stegosaurus and the biggest of the sauropod dinosaurs had second brains in their rumps. These dinosaurs, it was said, could reason “a posteriori” thanks to the extra mass of tissue. read more

When paleontologists originally discovered some dinosaurs such as Stegosaurus stenops they found a large void at the space of the back legs. They originally assumed that this was some sort of second brain, as a similar void was not present in modern day animals. read more

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