Brontosaurus
"Brontosaurus" was a large, long-necked quadrupedal animal with a long, whip-like tail, and forelimbs that were slightly shorter than its hindlimbs. The largest species, "B. excelsus", weighed up to and measured up to long from head to tail. For comparison, the current largest land animal, the average male African bush elephant is 3.20 m (10.5 ft) tall at the shoulder and has a body mass of 6,000 kg (13,228 lb) or 6.6 short tons.
Chasmosaurus
Chasmosaurus ( ) is a genus of ceratopsid dinosaur from the Upper Cretaceous Period of North America. Its name means 'opening lizard', referring to the large openings (fenestrae) in its frill (Greek "chasma" meaning 'opening' or 'hollow' or 'gulf' and "sauros" meaning 'lizard'). With a length of and a weight of , "Chasmosaurus" was a ceratopsian of average size. Like all ceratopsians, it was purely herbivorous. It was initially to be called "Protorosaurus", but this name had been previously published for another animal. All specimens of "Chasmosaurus" were collected from the Dinosaur Park Formation of the Dinosaur Provincial Park of Alberta, Canada. "C. russelli" comes from the lower beds of the formation while "C. belli" comes from middle and upper beds.