Beibeilong (meaning "baby dragon") is a genus of large caenagnathid dinosaurs that lived in Asia during the Late Cretaceous epoch, about 96 million and 88 million years ago. The genus contains a single species, Beibeilong sinensis, named and described in 2017 based on an embryonic skeleton (nicknamed Baby Louie) and partial nest with large eggs that were discovered from the Gaogou Formation of China between 1992 and 1993. Beibeilong was a notably large caenagnathid and among the largest oviraptorosaurs, estimated at long with a ponderous weight of about , based on comparisons with the closely related Gigantoraptor. The jaws were toothless and developed a horny beak (also known as rhamphotheca), as in most other oviraptorosaurs. Most of the anatomical traits of Beibeilong are consistent with caenagnathids rather than oviraptorids, which are two of the major oviraptorosaur families. It is classified within this group, Caenagnathidae, where it occupies a basal (primitive) position. Beibeilong laid one the largest known type of dinosaur eggs, Macroelongatoolithus. Its eggs measured around in length and had a ruggedly ornamented eggshell surface. The typical Macroelongatoolithus nest was ring-shaped with one or two layers of eggs, and the center was largely devoid of eggs. It is suggested that giant caenagnathids (like Beibeilong) sat directly in the empty-egg center to avoid egg-crushing because of their massive body dimensions. History of discovery During the late 1980s and early 1990s, Chinese farmers excavated and collected a large amount of fossilized dinosaur eggs from Cretaceous rocks and sediments at the Henan Province (China), Gaogou Formation, many of which were embbeded in sediments. Although Chinese authorities tried to regulate the export and eventual illegal sell of the newly discovered dinosaur eggs, many ended up outside the country away from rightful paleontological research, such as rock and gem shows, markets and/or stores during the early 1990s. While they were kept out of China, many of the blocks containing dinosaur eggs were prepared (cleaned) in other countries, which revealed exceptionally preserved embryos in some cases. Among these, a partial specimen block containing a long embryonic oviraptorosaur skeleton with several large eggs, discovered between December 1992 and early 1993 by farmer Zhang Fengchen, became renowned. Prior to the preparation of the block, this specimen was in 1993 imported into the United States by The Stone Company, which was responsible for the preparation. Some time later, the specimen was in 1996 featured on the cover article for