A 2015 study collected egg shell fragments of Genyornis from around 200 sites that show burn marks.[3] Analysis of amino acids in the egg shells showed a thermal gradient consistent with the egg being placed on an ember fire. The egg shells were dated to between 53.9 and 43.4 thousand years before present, suggesting that humans were collecting and cooking Genyornis eggs in the thousands of years before their extinction. A later study, however, suggests that the eggs actually belonged to the giant malleefowl, a species of extinct megapode.[4][5]