Angry Sparrow Swarm

These little birds are angry, and there's a lot of them.

Size/Type: Fine Animal (Swarm)
Hit Dice: 12d8 (48 hp)
Initiative: +5
Speed: 5 feet (1 square), fly 60 ft. (good)
Armor Class: 23 (+8 size, +5 Dex), touch 23, flat-footed 18
Base Attack/Grapple: +9/–
Attack: Swarm (3d6 plus 1d2 acid)
Full Attack: Swarm (3d6 plus 1d2 acid)
Space/Reach: 10 ft./0 ft.
Special Attacks: Angry chirping, distraction, droppings
Special Qualities: Immune to weapon damage, low-light vision, swarm traits
Saves: Fort +8, Ref +13, Will +6
Abilities: Str 1, Dex 20, Con 10, Int 2, Wis 15, Cha 11
Skills: Balance +12, Hide +22, Listen +10, Spot +10, Survival +12
Feats: Alertness, Dodge, Flyby Attack, Lightning Reflexes
Environment: Any
Organization: Solitary
Challenge Rating: 9
Alignment: Always neutral
Advancement: None
Level Adjustment: –

Angry Chirping (Ex)
When thousands of angry little birds chirp together, the sound might overwhelm the minds of the weak. Anyone capable of hearing the sparrows must succeed on a DC 16 Will save or become shaken for the duration of the angry chirping. A swarm of sparrows can chirp together for one minute (or 10 rounds). They can then resume chirping once 1d10 rounds have passed.

Droppings (Ex)
The swarm excretes copious amounts of droppings as it descends upon its enemies. Each succesful attack made by the swarm deals an additional 1d2 points of acid damage.