The Ornithopods are very large and diverse group of mainly herbivorous dinosaurs that lived between the Middle Jurassic and Late Cretaceous in (mainly) the Northern Hemisphere. There were many different forms and sizes and many had characteristic features, like horns, claws and beaks. The largest members could reach a stunning 15 m in length and weighted more than 20,000 kg!
Distribution & Fossil evidence
The earliest members of the Ornithopoda clade were very small in size, reaching just over a meter in length, but they were mostly build for speed. They were mainly bipedal and probably lived in small to large herds. Later species evolved to walk on both two and four feet and probably grazed on lower vegetation.
The Ornithopods are one of the most successfull groups of herbivorous dinosaurs that lived (mostly) during the Cretaceous. Many genera and species have evolved over millions of years.