Thescelosaurus

          Thescelosaurus

Thescelosaurus was a genus of small ornithopod dinosaur that appeared at the very end of the Late Cretaceous period in North America. This ornithopod is known from several partial skeletons and skulls that indicate it grew to between 2.5 and 4.0 meters (8.2 to 13.1 ft) in length on average. Thescelosaurus was a heavily built bipedal animal, probably herbivorous, but possibly omnivorous. It had short, broad, five-fingered hands, four-toed feet with hoof-like toe tips, and a long tail.

Tenontosaurus

Tenontosaurus (sinew lizard) is a genus of medium- to large-sized ornithopod dinosaur. The genus contains two species, Tenontosaurus tilletti (described by John Ostrom in 1970) and Tenontosaurus dossi (described by Winkler, Murray, and Jacobs in 1997). It was about 6.5 to 8 metres (21 to 26 ft) long and 3 metres (9.8 ft) high in a bipedal stance, with a mass of somewhere between 1 to 2 tonnes (1 to 2 short tons). It had an unusually long, broad tail, which, like its back, was stiffened with a network of bony tendons.