Styracosaurus was one of the smaller members of the ceratopsian family. It was still a sizable animal at 16 feet long and 1,500-2,000 pounds. It's nose horn was over 2 feet long. With over 10 horns on it's frill, this animal probably had the most horns of any dinosaur. Styracosaurus lived roughly 70 million years ago in North America.