n huge animal 

Perception +18; low-light vision, scent (imprecise) 30 feet

Skills Athletics +21, Stealth +18, Survival +18

Str +6 Dex +3 Con +5 Int -4 Wis +3 Cha +0

AC  27; Fort +20, Ref +18, Will +16

HP 160; Resistances acid 10, poison 10

Feign Death [R] Trigger The opossum is reduced below 70 HP; Effect The khravgodon collapses. It is flat-footed and can use actions that require only its mind, but any other action ends the ruse. A successful DC 18 Perception check to Seek or Medicine check to Recall Knowledge is required to determine that the animal is not, in fact, dead.

Revived Retaliation [R] Trigger The opossum is attacked or disturbed by a creature within reach while Feigning Death; Effect The opossum Strikes the triggering creature.

Speed 30 feet, burrow 15 feet, climb 15 feet

Melee [>] jaws +21 (deadly d12), Damage 2d12+9 piercing

Melee [>] claw +21 (agile), Damage 2d10+9 slashing

Melee [>] tail +21 (reach 20 feet), Damage 2d6+9 bludgeoning plus Grab

Crush Chitin [>] Requirements The khravgodon has a creature grabbed or restrained; Effect The khravgodon bites the creature, dealing 2d12+9 piercing damage (DC 28 basic Fortitude save) that ignores the first 5 of the target's Hardness or resistance to physical damage. On a failed save, the target also takes a –2 circumstance penalty to AC for 1 round.

Grasping Tail A khravgodon can drag a Large or smaller creature it has grabbed with its tail along with it when it Strides.

Bestiary 3, page 192.