A major gap in South Korea's prehistoric record has been filled with the discovery of Onggwanoolithus aphaedoensis, the first known bird-type dinosaur eggs from the Cretaceous period of South Korea. The find, which is detailed in a paper published in Palaeogeography, Palaeoclimatology, Palaeoecology, is a significant milestone because it is the first physical evidence of the bird-like dinosaurs thought to have left behind many of the region's fossil footprints.