pf2e.fyi
From Pathfinder Bestiary 3, which isn't enabled.

Monkey Swarm

CREATURE 2

A single monkey can cause mischief. A troop of monkeys, emboldened by their numbers, can cause utter chaos, attacking anyone and looting anything in sight before scattering away with whatever they can carry.


Monkeys vary greatly in size, color, and behavior. Some are distinguished by bright orange fur, others for black fur in sharp contrast with a white face. Some produce distinct noises, like howls that can be heard from a village away. Others vie for dominance within ever-changing social hierarchies. Their size and aptitude for climbing allow them to quickly escape threats; combined with being a little too clever for their own good, this allows them to get up to all sorts of mischief and usually escape to do it again.


Perception +8
Skills Acrobatics +8, Thievery +8
Str +0, Dex +4, Con +0, Int -4, Wis +2, Cha +0

AC 16; Fort +6, Ref +10, Will +6
HP 20; Immunities precision, swarm mind; Weaknesses area damage 3, splash damage 3; Resistances piercing 3, slashing 3
Cacophony (auditory, aura)

20 feet. The monkeys' awful racket of screeches and howls drowns out other sounds. Any creature performing an auditory action in the area must yell over the din, requiring a successful DC 15 Fortitude save or DC 15 Performance check to project loudly enough; on a failure, the action is lost.


Speed 25 feet, climb 20 feet
Ransack

The swarm rummages through the possessions of a single creature within its space, attempting a Thievery check against the creature's Reflex DC.

On a success, the monkeys take one random item of negligible Bulk that the creature is wearing but not closely guarding, such as an object in a loosely carried pouch.

Swarming Bites

Each creature in the swarm's space takes 1d8 piercing damage (DC 18 basic Reflex save).

Pathfinder Bestiary 3OGL