Okay, now to update again. A few weeks ago, I found an article that said that the world's smallest dinosaur was probably found. The fossil that was found in the south of the United Kingdom was less than 7.1 millimeters long, which is small for a neck bone. The animal is thought to have been 15.7 inches long, and is a bird-like dinosaur that lived in the Late Cretaceous Period.
For a long time, I thought the smallest dinosaur was the baby Mussaurus, which was the size of a mouse. The adults, however, probably got up to 10 feet in length. It's hard to say because the only skeletons found were either juveniles or babies. If this does turn out to be a new species, it'll prove that size didn't always matter in the world of the dinosaurs.