 It also lived in the same area as the large carnivorous dinosaur "Acrocanthosaurus".The presence of medullary bone tissue in the thigh bone and shin bone of one specimen indicates that "Tenontosaurus" used this tissue, today only found in birds that are laying eggs, in reproduction.Additionally, like "Tyrannosaurus" and "Allosaurus", two other dinosaurs known to have produced medullary bone, the tenontosaur individual was not at full adult size upon her death at 8 years old.