Ceratopsians are an iconic and well known dinosaur group, they are characterized by their distinct horns and large frills adorned with bony knobs and spikes. Ceratopsians are amongst the most diverse armored herbivores and range in size from the small protoceratops to the large titanoceratops. Each species has its own unuiqe frill shape with a different arrangement of horns and other external features. Ceratopsians are a one of a kind dinosaur that display features unlike any other dinosaur ever known.