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

Snout-tail length 305 mm

in Arizona

Height 99 mm

especialmente en la región torácica

Irritator challengeri Seymouria Fossil nests and the postureIrritator 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