Quaesitosaurus (meaning "abnormal or extraordinary lizard") was a huge, long-necked, whip-tailed, plant-eating dinosaur that was found in the Gobi Desert in Mongolia. "Quaesitosaurus" may have been about 75 feet (23 m) long. This sauropod dinosaur lived during the late Cretaceous Period, roughly 85-80 million years ago. "Quaesitosaurus" may be the same as "Nemegtosaurus". This environment was semi-arid during the Mesozoic Era.