The term "Family Hadrosauridae" refers to a group of dinosaurs commonly known as "duck-billed" dinosaurs. These dinosaurs were herbivores and lived during the Late Cretaceous period. Some synonyms for the term Hadrosauridae include duck-billed dinosaurs, hadrosaurs, hadrosaurids, and ornithopods. These dinosaurs were characterized by their unique dental morphology, which resembled the bill of a duck. They also had a large, flat head, and a long tail. Despite their large size, these dinosaurs were able to move quickly and were proficient swimmers. They are thought to have been among the most common dinosaurs of their time.