Homunculus (CR 1)

Tiny Construct
Alignment: Any (same as creator)
Initiative: +2 (Dex); Senses: Listen +4 and Spot +4
Languages: Cannot speak, telepathically links to its creator

AC: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Hit Dice: 2d10 (11 hp)
Fort +0, Ref +4, Will +1
Speed: 20 ft., fly 50 ft. (good)
Space: 2 1/2 ft./0 ft,
Base Attack +1; Grapple -8
Attack: Bite +2 melee
Full Attack: Bite +2 melee
Damage: Bite 1d4-1 and poison
Special Attacks/Actions: Poison
Abilities: Str 8, Dex 15, Con -, Int 10, Wis 12, Cha 7
Special Qualities: Construct
Feats: Lightning Reflexes
Skills: Hide +14, Listen +4, and Spot +4
Advancement: 3-6 HD (Tiny)
Climate/Terrain: Any land and underground
Organization: Solitary
Treasure/Possessions: None

Source: Monster Manual

Poison (Ex): Bite, Fortitude save (DC 11); initial damage sleep for 1 minute, secondary damage sleep for another 5d6 minutes.

Construct: Immune to mind-influencing effects, poison, disease, and similar effects. Not subject to critical hits, subdual damage, ability damage, energy drain, or death from massive damage.

Homunculi land on their victims and bite with their venomous fangs.