Giant Beetle, Bombardier (CR 2)

Medium Vermin
Alignment: Always Neutral
Initiative: +0; Senses: darkvision 60 ft.

AC: 16 (+6 natural), touch 10, flat-footed 16
Hit Dice: 2d8+4 (13 hp)
Fort +5, Ref +0, Will +0
Speed: 30 ft.
Space: 5 ft./5 ft.
Base Attack +1; Grapple +2
Attack: Bite +2 melee
Full Attack: Bite +2 melee
Damage: Bite 1d4+1
Special Attacks/Actions: Acid spray
Abilities: Str 13, Dex 10, Con 14, Int -, Wis 10, Cha 9
Special Qualities: vermin
Feats: -
Skills: -
Advancement: 3-4 HD (Medium-size); 5-6 HD (Large)
Climate/Terrain: Warm forest
Organization: Cluster (2-5) or swarm (6-11)
Treasure: None

Source: Monster Manual

These creatures feed primarily on carrion and offal, gathering heaps of the stuff in which to build nests and lay eggs. A giant bombardier beetle is about 6 feet long.

Giant bombardier beetles have no interest in other creatures. They normally attack only to defend themselves, their nests, or their eggs.