National Geographic : 1996 Jul
ADAMISAURUS(LIZARD) DJADOCHTATHERIUM (MULTITUBERCULATE MAMMAL) JUVENILEPROTOCERATOPS NationalGeographic,July 1996 Finest of their kind, Gobi skulls help scientists unmask a past when dinosaurs coexisted with mammals in the final period of reptilian dominance. The larger skulls belong to theropods- bipedal dinosaurs generally regarded as kin to modern birds. Prominent beaks distinguish the tooth less oviraptors (left), with the Ingenia type resembling a parrot in profile. A predator's ferocity is imprinted in the skull of a four- to five-foot-long mature Velociraptor (top), an exaggerated version of which created havoc in Hollywood's Jurassic Park. Equipped with the largest brains relative to their size among dinosaurs, theropods are now seen as swift, intelligent hunters. Some experts guess that because of their exceptional agility,troo dontids (below) might have been warm-blooded. The most common mammal skulls belong to multituberculates (upper left), small mammals with ambitious incisors.