Parksosaurus is relatively large hypsilophodont, around 2-4 metres long, and it was one of the last of it's family, living at the end of the Age of Reptiles. Found in Canada, it had blunt, peg-like teeth, suited to chewing thick leaves and fleshy fruit. Like other hypsilophodonts it had a tail stiffened by bony tendons. Held straight behind it, it's tail helped Parksosaurus keep it's balance.