Hypsilophodon foxii

For more than a century Hypsilophodon was seen as the quintessential small, lightly built ornithopod dinosaur. Living during the Early Cretaceous of England, where it’s best known from the Isle of Wight. Hypsilophodon was once proposed to be a tree-climber, although its anatomy is more consistent with a fast-running, ground-dwelling plant-eater, roughly the size of a large dog.