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Psittacosaurus mongoliensis (meaning parrot reptile) lived about 107 million years ago, during the Early Cretaceous.
Dinosaurs hatched from eggs before growing into adults. This skull, among the smallest dinosaur fossils known, is believed to represent a very young Psittacosaurus hatchling, life-sized models of which can be seen below. Note the relatively large eye socket and the short face. As in mammals and in many other dinosaurs, the skull proportions of Psittacosaurus changed as the hatchlings matured: the relative size of the eyes and brain decreased, and the snout lengthened.