Mary River Turtle (Elusor macrurus) - note the massive tail which gives them the specific name macrurus.
Thank you. Is the attached picture also a Mary River Turtle? It was in an enclosure signed for them, however the large ones above were unsigned in the Freshwater Crocodile enclosure.
I would say not, with that bright yellow eye. Maybe a Krefft's River Turtle or a Brisbane Short-necked Turtle perhaps.