Parksosaurus was an ornithopod dinosaur related to Othnelia, named after William Parks, the palaeontologist, who discovered it first in 1937. It was a smallish dinosaur - roughly 2.5 m long. It didn't have any particular anatomical features and was a distant relative of the bigger hadrosaurs, such as Anatotitan, also featured in WWD. It was also a close relative of Thescelosaurus.