👉 A hadrosaur, also known as a "carnivorous dinosaur," was a large theropod that lived during the Late Cretaceous period of the Mesozoic Era. They were primarily herbivores and were known for their distinctive long necks and powerful jaws. The exact number of species within the genus "Hadrosaurus" is not well-documented, but it is estimated to have numbered between 100 and 250, depending on the type and