Mekosuchine crocodiles dominated Australia's inland waters 55 million years ago. Photo: HANDOUT/UNIVERSITY OF NSW The oldest crocodile eggshells ever uncovered in Australia are shedding light on an ancient species that hunted in forests and might also have been "drop crocs", leaping onto their prey from trees. Found by scientists digging in clay pits near the southeast Queensland town of Murgon, the shell fragments are from now-extinct mekosuchine crocodiles.