Length 69 mm

suggesting that it could move quickly and efficiently

representing 43% of the known tetrapod species in the region

Fossil nests and the posture of adults on eggs have provided a crucial connection between dinosaurs and modern birds

Altura 53 mm

Irritator challengeri Seymouria Length 69 mmIrritator challengeri is a genus of spinosaurid theropod dinosaur that lived during the Early Cretaceous Period, approximately 110 million years ago, in what is now Brazil. Its name comes from the Latin "irritator", in reference to the frustration of paleontologists upon discovering that the original fossil had been altered with plaster by the collectors who found it, and "challengeri" in honor of Professor Challenger, a fictional character created by