Walnut the True Measure of a Dinosaur’s Brain.
Ampelosaurus had a surprisingly small brain. All fifty feet of the dinosaur – from its pencil-toothed muzzle to the tip of its long tail – was regulated by a mass of tissues about the size of a walnut and a half. That comparison isn’t sloppy shorthand. Ohio University paleontologist Lawrence Witmer actually went to the trouble of comparing the hulking sauropod’s brain to an English walnut to test and confirm this old axiom.