Megafauna, Megalania

This gigantic lizard has short but powerful limbs, a muscular tail, and a spiny crest that runs the length of its body.

Megalania CR 7

XP 3,200
N Huge animal
Init +1; Senses low-light vision, scent; Perception +10

AC 21, touch 9, flat-footed 20 (+1 Dex, +12 natural, -2 size)
hp 85 (10d8+40)
Fort +11, Ref +8, Will +7

Speed 30 ft., swim 30 ft.
Melee bite +14 (2d8+12 plus grab and poison)
Space 15 ft.; Reach 10 ft.
Special Attacks swallow whole (2d8+12 bludgeoning damage, AC 16, 8 hp)

Str 27, Dex 13, Con 19, Int 2, Wis 14, Cha 6
Base Atk +7; CMB +17; CMD 28 (32 vs. trip)
Feats Iron Will, Lunge, Skill Focus (Perception), Skill Focus (Stealth), Weapon Focus (bite)
Skills Climb +12, Perception +10, Stealth +10 (+14 in rocks or undergrowth), Swim +16; Racial Modifiers +4 Stealth (+8 in rocks or undergrowth)

Poison (Ex)

Bite; save Fort DC 19; frequency 1/round for 6 rounds; effect 1d4 Dex damage; cure 2 consecutive saves.

Source Wikipedia

Environment warm forests or plains
Organization solitary, pair, or pack (3-12)
Treasure none

The immense megalania is often mistaken for a dragon or dinosaur. Certainly the lizard’s aggressive attitude and deep, rumbling roars only encourage such misidentifications. Large enough to catch and eat rhinos and elephants, a megalania prefers hunting much smaller prey that it can gulp down in one greedy swallow. Humanoids are among its favorite meals. A megalania is 20 feet long and weighs 2,000 pounds.

Section 15: Copyright Notice Pathfinder Roleplaying Game Bestiary 3, © 2011, Paizo Publishing, LLC; Authors Jesse Benner, Jason Bulmahn, Adam Daigle, James Jacobs, Michael Kenway, Rob McCreary, Patrick Renie, Chris Sims, F. Wesley Schneider, James L. Sutter, and Russ Taylor, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.