 Hans Sues, a Smithsonian palaeontologist who helped analyse the 190-million-year-old eggs — the oldest from a vertebrate animal ever discovered — confirmed that Kitching had been correct in his identification of the eggs.The embryos are so well preserved, that they have yielded remarkable insights into dinosaur biology and behaviour.They are the oldest evidence for caregiving among dinosaurs in that the animals' undeveloped teeth suggest that Massospondylus hatchlings needed help in feeding.