Tenontosaurus was a herbivorous dinosaur that lived during the Early Cretaceous period, approximately 125 million years ago. It was a medium-sized dinosaur, measuring about 20 feet long. Its body was characterized by a long tail, a small head, and a robust build, which helped it navigate through its forested habitat. This dinosaur is known for its unique skeletal structure, which included long limbs and a flexible neck. Tenontosaurus is often associated with the Iguanodon, as both were part of the same family of dinosaurs. Fossils have been found primarily in North America, providing valuable insights into the ecosystems of that era.