Steven David Miller / Saw-shelled turtle {Elseya latisternum} covered in silt, resting at water surface in freshwater, Eungella National Park, Queensland, Australia

Roger Powell / Saw-shelled Turtle (Elseya latisternum) Ross River, Queensland, Australia

Roger Powell / Saw-shelled Turtle (Elseya latisternum) Ross River, Queensland, Australia

Bruce Thomson / Saw-shelled turtle (Elseya latisternum) portrait, Yungaburra, Queensland, Australia.

Bruce Thomson / Two Saw-shelled turtles (Elseya latisternum) on rock in middle of pool, one on top of the other, competing for basking postion, Yungaburra, Queensland, Australia.

Etienne Littlefair / Northern snapping turtle (Elseya dentata) female walking along a creek bed, Pine Creek region, Northern Territory, Australia.

Joel Sartore / Photo Ark / Southern New Guinea stream turtle (Elseya rhodini) head portrait, private collection. Captive, occurs in New Guinea.

Joel Sartore / Photo Ark / Southern New Guinea stream turtle (Elseya rhodini) portrait, private collection. Captive, occurs in New Guinea.

Etienne Littlefair / Looking up at Irwin's turtle (Elseya irwini), large adult female found on the surface, possibly breathing or warming up, North Johnstone River near Malanda, Australia. August.

Etienne Littlefair / Northern snapping turtle (Elseya dentata) swimming away in mid-water column, Daly region, Northern Territory, Australia. June.

Etienne Littlefair / Northern snapping turtle (Elseya dentata) swimming, possibly surfacing for air, Daly region, Northern Territory, Australia. June..

Etienne Littlefair / Northern snapping turtles (Elseya dentata), resting in an underwater cave shared with other northern snapping turtles, Katherine region, Northern Territory, Australia. July.