Hadrosaurinae is a subfamily of dinosaurs known as duck-billed dinosaurs, which lived during the Late Cretaceous period. They are characterized by their flat, broad snouts that resemble a duck's bill, and they were primarily herbivorous, feeding on plants. These dinosaurs were social animals, often found in large herds. Hadrosaurinae includes well-known genera like Hadrosaurus and Lophorhothon, which are recognized for their unique dental structures that allowed them to efficiently process tough vegetation. Their fossils have been discovered in North America, Europe, and Asia.