Monkey Swarm
This entry can be used for generic monkeys as well as provide a baseline for swarms of the primates. Monkey bites are unfortunately not at all uncommon. Monkeys can carry diseases such as tetanus and rabies. The judge is recommended to use the disease table for bats in the core rulebook or the rabies guidelines found on page 22 of this work. You could even pump up the risk, considering the virulence of some monkey bites, but if you do this you should make sure that the players have some way of knowing that monkey bites are dangerous. In general, Fort DCs for single monkey bites should be no higher than DC 1d4+1, but standard DCs apply to attacks from swarms. An arboreal monkey swarm can also fling feces, sticks, overripe fruit, and the like at targets prior to melee attacks. These attacks allow the swarm to target all creatures in a 30' x 30' square, which must make Will saves (DC 5 +1 per additional round) to avoid fleeing the area. Of course, the monkeys can move faster than most targets, so fleeing is seldom effective. A monkey swarm can use this tactic to drive targets toward preferred attack sites, or away from their territory.
Summary
Init +4; Atk swarming bite +5 melee (1d5 plus disease); AC 13; HD 8d8; MV 40’ or climb 40’; Act special; SP bite all targets within 20’ x 20’ space, half damage from non-area attacks, fling feces and sticks, disease (see below); SV Fort +3, Ref +5, Will -2; AL N.