From Pathfinder Society Scenario #6-08: Upon Wheels and Rime, which isn't enabled.

Zombie Crow Flock

CREATURE 1

Perception +4; darkvision

Skills Acrobatics +7

Str +1, Dex +3, Con +2, Int -5, Wis +0, Cha -4

AC 16; Fort +10, Ref +7, Will +4

HP 25, void healing; Immunities bleed, death effects, disease, grabbed, mental, paralyzed, poison, precision, prone, swarm mind, unconscious; Weaknesses area damage 5, splash damage 5, vitality 5

Slow

A zombie crow swarm is permanently Slowed and can't use reactions.

Void Healing

A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead.

Speed 25 feet, fly 25 feet

Swarming Pecks

Each enemy in the swarm's space takes 1d8 piercing damage (DC 17 basic Reflex save)

Pathfinder Society Scenario #6-08: Upon Wheels and RimeORC