Snake, Flying (CR 1/2)

Small Magical Beast
Alignment: Usually neutral
Initiative: +3 (Dex); Senses: scent, Listen +8, and Spot +8

AC: 17 (+1 size, +3 Dex, +3 natural), touch 14, flat-footed 14
Hit Dice: 1d10 (5 hp)
Fort +2, Ref +5, Will +1
Speed: 20 ft., climb 20 ft., fly 20 ft. (average)
Space: 5 ft./5 ft.
Base Attack +2; Grapple +5
Attack: Bite +5 melee
Full Attack: Bite +5 melee
Damage: Bite 1d3-2 plus 1 acid
Special Attacks/Actions: Acid spit, improved grab, constrict
Abilities: Str 6, Dex 17, Con 11, Int 1, Wis 12, Cha 2
Special Qualities:
Feats: Alertness; Weapon Finesse (bite)
Skills: Balance +11, Climb +12, Hide +12, Listen +8, and Spot +8
Advancement: -
Climate/Terrain: Any forest or marsh
Organization: Solitary or flight (2-8)
Treasure/Possessions: None

Source: Races of Faerûn

Acid Spit (Ex): Once per round, a flying fang can spit acid as a ranged touch attack. The acid spit deals 1 hit point of acid damage but is insufficient to count as a grenadelike weapon. A flying fang that bites an opponent automatically deals an additional 1 point of damage from acid.

Improved Grab (Ex): To use this ability, the flying snake must hit with its bite attack. If it gets a hold, it can constrict.

Constrict (Ex): A flying snake deals 1d3-2 points of damage with a successful grapple check against Tiny or smaller creatures.

Skills: Flying snakes receive a +4 racial bonus on Hide, Listen, and Spot checks, and a +8 racial bonus on Balance checks. They can use either their Strength or Dexterity modifier for Climb checks, whichever is better.

Flying snakes bite with their needle-sharp fangs or spit globs of acid at foes. They will attack any living thing they can slay and eat.