Hadrosauridae is a family of large, herbivorous dinosaurs known as "duck-billed" dinosaurs. They lived during the Late Cretaceous period, approximately 75 to 80 million years ago. Hadrosaurs are characterized by their flat, broad snouts and complex dental structures, which allowed them to efficiently chew tough plant material. These dinosaurs were social animals, often found in large herds. They had strong limbs and were capable of both bipedal and quadrupedal movement. Fossils of hadrosaurs have been discovered in various parts of the world, providing valuable insights into their behavior and environment during the time they roamed the Earth.