Encounters by Locale: Cormanthor - The Starwood

Snake, Winged Viper (CR 2)

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

AC: 15 (-1 size, +3 Dex, +3 natural), touch 12, flat-footed 12
Hit Dice: 3d3 (13 hp)
Fort +3, Ref +6, Will +2
Speed: 20 ft., fly 50 ft. (good)
Space: 10 ft./5 ft.
Base Attack +2; Grapple +6
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d4 and poison
Special Attacks: Poison
Abilities: Str 10, Dex 17, Con 11, Int 1, Wis 12, Cha 2
Special Qualities:
Feats: Alertness; Weapon Finesse
Skills: Balance +12, Climb +6, Hide +5, Listen +7, and Spot +7
Advancement: -
Climate/Terrain: Any temperate and warm forest
Organization: Solitary
Treasure: None

Source: Forgotten Realms Campaign Setting

Poison (Ex): With each successful bite attack, the winged viper delivers a debilitating poison. This substance deals 1d6 temporary Constitution points as both its initial and secondary damage. The target is entitled to a Fortitude save (DC 11) against each.

Faerûnian Random Encounters by Region and Locale