n large animal swarm 

Perception +13; low-light vision

Skills Acrobatics +17, Stealth +17

Str +2 Dex +6 Con +4 Int -4 Wis +2 Cha +4

AC  25; Fort +15, Ref +17, Will +13

HP 85; Immunities precision, swarm mind; Weaknesses area damage 7, splash; Resistances bludgeoning 3, piercing 7, slashing 7

Pour Down Throat [R] Trigger A creature in the sportlebore swarm's area speaks, uses a verbal component, or opens its mouth; Effect A portion of the sportlebore swarm attempts to surge down the throat of the triggering creature, which must attempt a DC 25 Fortitude save. Critical Success The creature is unaffected.Success The creature gets a mouthful of sportlebores. It spits the insects out and avoids further damage, but it can't speak for 1 round, and if it was performing a verbal spellcasting action, the spell fails and the caster wastes the action.Failure The creature takes 4d6 piercing damage from sportlebore bites, can't speak for 1 round, and loses a spell as noted under Success.Critical Failure As failure, but the creature is also exposed to sportlebore infestation.

Speed 35 feet, fly 35 feet

Swarming Bites [>] Each creature in the sportlebore swarm's area takes 4d6 piercing damage (DC 25 basic Reflex save).

Bestiary 2, page 251.