no it actually probably had a large brain (which would be normal for its size)
About 500 grams. Roughly the size of an apple
The Stegosauruses cousin (like any other Dinosaur) is the lizard.
That sounds like a hedge apple. I use to call it a brain tree when I was a kid, because a hedge apple resemble a brain.
The size of an average apple is about the size of an adult Male's fist.
plants plants tree leaves
Due to food coloring and sugar, apple sause and candy are not good for your brain.
plats
Stegosauruses is valid (http://en.wiktionary.org/wiki/stegosauruses), but so is Stegosaurus (http://www.memidex.com/stegosaurus+reptile-genus). The same way Fish and Fishes are both valid. Usage is the same as well.
apple size
there brain is about the size of a base ball
2/3 of the size of an adult brain
what is the size of a 10mm leasion on the brain