Late Cretaceous – 70 – 65.5 Mya
Length: 10 -12 meters (33 – 39 feet)
Height: 4.9 meters (16 feet)
Weight: 5,000 kg (11,023 lb)
Hadrosaurs were very successful dinosaurs during the closing stages of the late Cretaceous. Divided into two principal sub-families, hadrosaurines and lambeosaurines, it is the latter that are the most spectacular due to the radical modification of the nasal cavity and the elaborate hollow crests rising from the skull. Lambeosaurines originated in Asia and migrated to North America across the Beringian isthmus flourishing in the late Cretaceous to such an extent that some species are referred to as the cows of the Cretaceous.
Excavated during the 1999 – 2001 seasons in the Amur Region of the Russian far east, Olorotitan is the most complete hadrosaur skeleton found outside of North America.