rare n gargantuan animal 

Perception +24; low-light vision, scent (imprecise) 30 feet

Skills Athletics +28

Str +9 Dex +0 Con +5 Int -4 Wis +5 Cha -2

Deep Breath The mammoth turtle can hold its breath for 4 hours.

AC  36; Fort +26, Ref +22, Will +26

HP 270

Speed 20 feet, swim 50 feet

Melee [>] jaws +29, Damage 3d12+14 piercing plus

Improved Grab

Capsize [>] (attack, move) As giant snapping turtle, but DC 43.

Fling [>] Requirements The turtle has a creature grabbed in its jaws; Effect The turtle flings the creature into the air from its mouth, sending it up to 10 feet up and 20 feet away. The creature falls 25 feet (assuming the turtle flings it as high as it can) and takes the appropriate amount of bludgeoning damage from the fall.

Shell Defense [>] As giant snapping turtle, but.

Fists of the Ruby Phoenix #1: Despair on Danger Island, page 31.