High Quality Content by WIKIPEDIA articles! Judinornis is a prehistoric flightless bird genus from the Late Cretaceous. The single known species is Judinornis nogontsavensis. Its fossils have been found in Nemegt Formation rocks of southern Mongolia, and as the age of these deposits is not entirely resolved, Judinornis may have lived some 70 million years ago (mya) during the early Maastrichtian, or perhaps somewhat earlier, 76 mya, during the Campanian.