Snake, Small Viper (CR 1/2)

Small Animal
Alignment: Always neutral
Initiative: +3 (Dex); Senses: scent, Listen +7, and Spot +7


AC: 17 (+1 size, +3 Dex, +3 natural), touch 14, flat-footed 14
Hit Dice: 1d8 (4 hp)
Fort +2, Ref +5, Will +1
Speed: 20 ft., climb 20 ft., swim 20 ft.
Space: 5 ft./5 ft.
Base Attack +0; Grapple -6
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d2-2 and poison
Special Attacks/Actions: Poison
Abilities: Str 6, Dex 17, Con 11, Int 1, Wis 12, Cha 2
Special Qualities:
Feats: Improved Initiative; Weapon Finesse
Skills: +11, Balance, Climb +11, Hide +11, Listen +7, Spot +7, and Swim +6
Advancement: -
Climate/Terrain: Warm forest
Organization: Solitary
Treasure: None

Source: Monster Manual

Combat

Poison (Ex): Bite, Fortitude save (DC 11); initial and secondary damage 1d6 temporary Constitution.

Improved Initiative: +4 on Initiative checks