This Image provided by the University of Toronto January 23, 2012 shows a close-up of an embryonic skeleton of a Massospondylus from a clutch of eggs at the nesting site at the Golden Gate Highlands National Park, South Africa. The head was pushed out ofion of complex reproductive behaviour in early dinosaurs. The newly unearthed dinosaur nesting ground predates previously known nesting sites by 100 million years, according to study authors, Drs. Hans-Dieter Sues (Smithsonian Institute, USA), Eric Roberts (James Cook University, Australia), and Adam Yates (University of the Witwatersrand, South Africa). AFP PHOTO/HANDOUT/University of Toronto / D.Scott = RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT " AFP PHOTO /University of Toronto / D. Scott " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS = (Photo credit should read HO/AFP/Getty Images)