A troodon....
Btw, the previous person who wrote an answer to this questions, i have something to say to you. If you don't know the answer, don't guess. Or reply with something more stupid.... which is what you did...
Stegosaurus was nine metres long, and its brain was about the size of a walnut. This makes it the dinosaur with the smallest brain for its body size. Stegosaurus is dummest.
A walnut can become a fossil through a process called permineralization, where minerals replace the organic material of the walnut over time. This preserves the structure of the walnut in stone, creating a fossil. Over millions of years, the surrounding sediment hardens, forming a mineral cast of the walnut.
because it looks like a brain.
the brain
a walnut
A sloths brain is only about the size of a walnut.
The fastest dinosaur that ever lived was the cheetah-sized dinosaur called the Compsognathus.
The area in the brain that controls hunger and cravings is called the hypothalamus. It plays a key role in regulating appetite, metabolism, and energy balance.
Robotic bigfoot would pwn a two headed dinosaur because a dino has a pea sized brain maybe even smaller than a grain of sand. :P :)
Walnut sized mass in left lung
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.
Its look like the inside of a walnut.