Triceratops

Triceratops is a genus of herbivorous ceratopsid dinosaur that first appeared during the late Maastrichtian stage of the late Cretaceous period, about 68 million years ago (mya) in what is now North America. It is one of the last known non-avian dinosaur genera, and became extinct in the Cretaceous–Paleogene extinction event 66 million years ago. The term Triceratops, which literally means "three-horned face", is derived from the Greek τρί- (tri-) meaning "three", κέρας (kéras) meaning "horn", and ὤψ (ops) meaning "face".

Description
Individual Triceratops are estimated to have reached about 7.9 to 9.0 m (25.9–29.5 ft) in length, 2.9 to 3.0 m (9.5 to 9.8 ft) in height, and 6.1–12.0 tonnes (13,000–26,000 lb) in weight. The most distinctive feature is their large skull, among the largest of all land animals. The largest known skull (specimen MWC 7584, formerly BYU 12183) is estimated to have been 2.5 metres (8.2 ft) in length when complete, and could reach almost a third of the length of the entire animal. It bore a single horn on the snout, above the nostrils, and a pair of horns approximately 1 m (3.3 ft) long, with one above each eye. In 2010, paleontologists revealed a fossil (named "Yoshi's Trike," MOR 3027) with 115-centimetre-long (3.77 ft) horn cores, housed and displayed at the Museum of the Rockies in Montana.To the rear of the skull was a relatively short, bony frill, adorned with epoccipitals in some specimens. Most other ceratopsids had large fenestraein their frills, while those of Triceratops were noticeably solid.