Compsognathus (CR 1/2)

Tiny Animal
Alignment: Always neutral
Initiative: +4 (Dex); Senses: low-light vision, scent, Listen +4, and Spot +4

AC: 16 (+2 size, +4 Dex), touch 16, flat-footed 12
Hit Dice: 1d8 (4 hp)
Fort +2, Ref +6, Will +2
Speed: 30 ft.
Space: 2 1/2 ft./0 ft.
Base Attack +0; Grapple -11
Attack: Bite +6 melee
Full Attack: Bite +6 melee
Damage: Bite 1d3-3 plus infection
Special Attacks/Actions: Infection
Abilities: Str 4, Dex 19, Con 10, Int 2, Wis 14, Cha 11
Special Qualities: resistant to disease
Feats: Stealthy; Weapon Finesse
Skills: Hide +14, Listen +4, Move Silently +6, and Spot +4
Advancement: 2-3 HD (Tiny)
Climate/Terrain: Warm forests
Organization: Solitary, pair, pack (3-6) or swarm (7-12)
Treasure/Possessions: None

Source: Dragon #318

Infection (Ex): When a creature is bitten by a compsognathus, it must succeed at a DC 10 Fortitude save or take 1 point of Strength damage. This saving throw must be repeated once per minute for 1d6 minutes to avoid taking additional Strength damage. The effects of multiple bites are cumulative. Although this effect is similar to poison, it is in fact more closely related to a disease. Neutralize poison and poison immunity have no effect on this Strength damage, but remove disease immediately stops the effects of all such wounds. Creatures that are immune to disease are also immune to this infection. The save DC is Constitution-based.

Resistant to Disease (Ex): A compsognathus is immune to the infectious material produced by its bite and to the bites of other compsognathi. Against other diseases, it gains a +4 racial bonus on all saving throws.

A compsognathus never attacks creature larger than itself unless it is part a swarm that grossly outnumbers the enemy. The jaws of a compsognathus contain dozens of tiny pockets that collect virulent bits of infected food. When they bite, this infected material is transferred into the victim's wound. They prefer to dart in and bite at their prey, then run a safe distance away and watch as their infectious bite takes effect before moving back in for the kill.