Othnielosaurus is a genus of ornithischian dinosaur that lived about 155 to 148 million years ago, during the Late Jurassic-age Morrison Formation of the western United States. Othnielosaurus is known from material from all parts of the body, including two good skeletons, although the skull is still poorly known. Othnielosaurus was a small animal, 2 meters (6.6 ft) or less in length and 10 kilograms (22 lb) or less in weight. It was a bipedal dinosaur with short forelimbs and long hindlimbs with large processes for muscle attachments. The hands were short and broad with short fingers.

Ouranosaurus ("Brave (monitor) lizard") was an unusual iguanodont that lived during the early Cretaceous (late Aptian stage) about 110 million years ago in what is now Africa. Ouranosaurus measured about 7 meters long (24 ft) and weighed about 4 tons. Two complete fossils were found in the Echkar (or El Rhaz) Formation, Gadoufaouna deposits, Agadez, Niger, in 1966 and the animal was named in 1976 by French paleontologist Philippe Taquet.

Parasaurolophus ("Near crested lizard") is a genus of ornithopod dinosaur from the Late Cretaceous Period of what is now North America, about 76-73 million years ago. It was a herbivore that walked both as a biped and a quadruped. As is the case with most dinosaurs, the skeleton of Parasaurolophus is incompletely known. The length of the type specimen of P. walkeri is estimated at 9.5 meters (31 ft). Its skull is about 1.6 meters (5.2 ft) long and its weight is estimated at 2.5 tonnes (2.7 tons). Its single known forelimb was relatively short for a hadrosaurid, with a short but wide shoulder blade. The thighbone measures 103 centimeters (3.38 ft) long in P. walkeri and is robust for its length when compared to other hadrosaurids. The upper arm and pelvic bones were also heavily built.

Saurolophus ("Lizard crest") is a genus of large hadrosaurine duckbill that lived about 70 million years ago, in the Late Cretaceous of North America (Canada) and Asia (Mongolia); it is one of the few genera of dinosaurs known from multiple continents. It is distinguished by a spike-like crest which projects up and back from the skull. Saurolophus was a herbivorous dinosaur which could move about either bipedally or quadrupedally.

Tenontosaurus is a genus of medium- to large-sized ornithopod dinosaur. It was formerly thought to be a 'hypsilophodont', but since Hypsilophodontia is no longer considered a clade, it is now considered to be a very primitive iguanodont. The genus is known from the Early to Middle Cretaceous sediments of western North America, dating to around 125 to 105 million years ago. It was about 6.5 to 8 metres (21 to 26 ft) long and 2.2 metres (7.2 ft) high, with a mass of somewhere between 1 to 2 tonnes (1 to 2 short tons). Its tail was longer than other members of the family, and it walked on four feet most of the time.

Tsintaosaurus is a genus of hadrosaurid dinosaur from China. It was about 10 metres (33 ft) long, 3.6 metres (12 ft) tall and weighed 3 tons. As a hadrosaur, Tsintaosaurus had a characteristic 'duck bill' snout and a battery of powerful teeth which it used to chew vegetation. It usually walked on all fours, but could rear up on its hind legs to scout for predators and flee when it spotted one. Like other hadrosaurs, Tsintaosaurus probably lived in herds. Tsintaosaurus was initially reconstructed with a unicorn-like crest on its snout. Although the 'crest' was later identified as a broken skull bone, indicating the specimen was actually Tanius, a second specimen with the horn has since been discovered.