Their large shell is called a carapace, they have four strong, paddle-like flippers and like all reptiles, lungs for breathing air. Their tough, beak-like mouth is used to slice or crush food. Most turtle species are experiencing serious threats to their survival. The main threats are pollution and changes to important turtle habitats, and the impact of global commercial fishing.
There are only a few large nesting populations of the green, hawksbill and loggerhead turtles left in the world. Australia has some of the largest marine turtle nesting areas in the Indo-Pacific region. Of the seven species of marine turtles in the world, six occur in Australian waters, and with the only nesting populations of the flatback turtle.: Flatback turtle (Natator depressus) Green turtle (Chelonia mydas) Hawksbill turtle (Eretmochelys imbricata) Leatherback turtle (Dermochelys coriacea) Loggerhead turtle (Caretta caretta) Olive Ridley turtle (Lepidochelys olivacea)