Scientists have uncovered the oldest dinosaur embryos ever found. They date to the beginning of the Jurassic age 190 million years ago. The find, which has taken years to decipher, is helping the understanding of the development of a long-necked, plant-eating giant, Massospondylus carinatus. The report by Robert R. Reisz and others at the University of Toronto, the Smithsonian Institution's National Museum of Natural History and the University of the Witwatersrand, South Africa, is published in Friday's issue of Science. James Clark of George Washington University in Washington, who was not part of the research group, said: "The importance of the discovery is that they are from a primitive member of the sauropodomorphs, a large group that includes the largest land animals that ever lived. Sauropodomorph embryos are rare, and the only previously known embryos of this group, from Argentina, are from a much later and more specialised form."