Protoceratops nests containing fossilized eggs and even babies have been found, providing valuable insights into their reproductive behavior. elaborate
Monolophosaurus had a single, prominent crest on its head, which may have been used for display or species recognition. elaborate
Lambeosaurus had a large, hollow crest on its head that likely played a role in both species recognition and vocalization. elaborate
Edmontosaurus had a toothless beak, similar to a duck's, but with powerful jaws for chewing tough plants. elaborate
Spinosaurus had a sail on its back, possibly used for display, thermoregulation, or both. elaborate