OLogy Cards > Psittacosaurus mongoliensis

Surprising Discoveries
Henry Fairfield Osborn described two incomplete Psittacosaurus skeletons found in Mongolia during the Central Asiatic Expedition of 1922. Osborn originally thought that the fossils belonged to two different species of dinosaurs. He later realized that they were both Psittacosaurus specimens. During this expedition, Osborn also found a rock that contained what he thought were only a few Psittacosaurus bones. When this fossil was prepared back at the Museum, the scientists discovered two young Psittacosaurus skulls. Paleontologists believe he stumbled upon a Psittacosaurus nest.