Tenontosaurus was a medium-sized bird-footed dinosaur. Living in the early Cretaceous Period, this plant-eater spent its time crouched on all fours foraging for food, or standing on its rear legs trying to reach food high in the treetops. Tenontosaurus probably spend most of its time walking on its rear legs, while using its front legs to grasp objects and also defend itself. Discovered in North America and named in 1970 by John Ostrom, Tenontosaurus had a beak similar to other bird-footed dinosaurs.
Name: Tenontosaurus (Sinew Lizard)
Size: 6.5 -8 Meters long
Known Location: Western North America
Time Period: Early Cretaceous 125 Million Years ago.