From Pathfinder #213: Thirst for Blood, which isn't enabled.

Animal Pit

HAZARD 0

MECHANICAL TRAP

Stealth +8 (DC 14 if the trap has been activated within the last day, or 0 if the trap door is disabled or broken)

Description A weight-activated trap door covers a pit that's 10 feet square and 20 feet deep.

Disable DC 12 Thievery to remove the trap door

AC 10; Fort +1, Ref +1

Hardness 3, HP 12 (BT 6); Immunities critical hits, precision

Pitfall

Trigger A creature weighing at least 20 pounds walks onto the trap door

Effect The triggering creature falls in and takes falling damage (typically 10 bludgeoning damage). That creature can use the Grab an Edge reaction to avoid falling.

Reset The trapdoors automatically reset to their closed position once a creature falls in, allowing for more creatures to fall in, though any camouflage on the trap door falls in as well, making it easier for creatures to notice the trap door.

Pathfinder #213: Thirst for BloodORC