Cockatrice

Creature 3

Small
beast

Perception: +8; darkvision
Skills: Acrobatics +11; Str −2, Dex +4, Con +1, Int −3, Wis +1, Cha −1

AC: 17; Fort +8, Ref +11, Will +6
HP: 45; Immunities petrified

Speed: 20 feet, fly 40 feet

Melee ◆ beak +13 (finesse, magical, unarmed), Damage 1d8-2 piercing plus Calcification

Calcification (incapacitation, primal) A peck from a cockatrice hardens the flesh of the creature struck. The target must succeed at a DC 20 Fortitude save or become Slowed 1 (or Slowed 2 on a critical failure). Further failed saves against calcification increase the slowed condition. Once a creature's actions are reduced to 0 by calcification, that creature becomes Petrified. If the creature isn't petrified, the slowed conditions end once 1 minute passes without the creature failing a save against calcification.

Every 24 hours after it was petrified, the victim can attempt a DC 20 Fortitude save to recover. On a success, it becomes flesh again, but is slowed 1 for the next 24 hours. On a critical success, the creature recovers and isn't slowed. On a failure, the creature remains petrified but can try again in 24 hours. On a critical failure, the petrification is permanent, and the creature can't attempt any more saves.

Source: Pathfinder Monster Core

Running this fight? Add the cockatrice to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.