Hoard Scarab (CR 1/2)

Fine Vermin
Alignment: Always neutral
Initiative: +1 (Dex); Senses: tremorsense 20 ft. and Listen +5
Languages: No language

AC: 11 (+8 size, +1 Dex, +2 natural), touch 19, flat-footed 20
Hit Dice: 1/8d8+1 (2 hp)
Fort +3, Ref +1, Will +1
Speed: 20 ft., climb 20 ft.
Space: 1 ft./0 ft.
Base Attack +0; Grapple -21
Attack: Bite +3 melee
Full Attack: Bite +3 melee
Damage: bite 1d2-5
Special Attacks/Actions: Burrowing
Abilities: Str 1, Dex 13, Con 13, Int -, Wis 12, Cha 2
Special Qualities: Vermin traits
Skills: Hide +13* and Listen +5
Advancement: None
Climate/Terrain: Warm deserts
Organization: Solitary or cluster (2-5)
Treasure: None

Source: Draconomicon

A hoard scarab is an eyeless, beetlelike creature that hides in piles of treasure. Thanks to its size and its silver or golden shell, it looks much like a coin when dormant (though close observation reveals its nature). A swarm resembles a pile of gold and silver pieces.

Hoard scarabs are often hidden among the treasure of a dragon (hence their name). They often live in a symbiotic relationship with the dragon, keeping the wyrm's scales clean of troublesome vermin (the dragon's natural armor keeps it safe from the scarab's burrowing ability).

Hoard scarabs are unintelligent and cannot speak or understand any languages.