Adasaurus is found in The Field Museum which was named by Rinchen Barsbold in 1983. It has been described as being very alike to Archeopteryx and its discovery added fuel to the present debate concerning dinosaurs and birds. Only unfinished fossils have been found, all in Mongolia, but based mainly in the Gobi desert region.
At six feet (two meters) long and two feet (.7 meters) tall, normally about he size of a large dog, Adasaurus weighed only 33 pounds (15 kilograms) and may have had feathers. Like Velociraptor dinosaurs, it was bipedal with a big, sickle-like claw on each foot.
Aspects of the Adasaurus dinosaurs pelvis, which is very alike to that of ornithischians, lead some scientists to believe that it is actually more closely connected to birds than to dinosaurs.