Snake, Huge Viper

Huge (Animal) CR 3
HP 33, hd6d8+6 AC 15 (?2 size, +2 Dex, +5 natural),, touch 10, flat-fooded 15 Fort +6, Ref +7, Will +3 Speed 20 ft. (4 squares), climb 20 ft., swim 20 ft. Initiative +6 Spot , Listen
Standard attacks BAB +4, Grapple +15
Attacks
Full attack: Bite +6 melee (1d6+4 plus poison)
Special Attacks/Qualities
Poison
Scent
Skills Balance +10, Climb +11, Hide +3, Listen +7, Spot +7, Swim +11
Feats Improved Initiative, Run, Weapon Focus (bite)
Str 16 Con 13 Dex 15 Int 1 Wis 12 Cha 2
Alignment Always neutral, Environment Temperate marshes, Organisation Solitary

These creatures range widely in size. They are not particularly aggressive, but will often lash out with a bite attack before attempting to retreat.
Skills: Snakes have a +4 racial bonus on Hide, Listen, and Spot checks and a +8 racial bonus on Balance and Climb checks. A snake can always choose to take 10 on a Climb check, even if rushed or threatened. Snakes use either their Strength modifier or Dexterity modifier for Climb checks, whichever is higher. A snake has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.

Viper snakes rely on their venomous bite to kill prey and defend themselves.
Poison (Ex): A viper snake has a poisonous bite that deals initial and secondary damage of 1d6 Con. The save DC varies by the snake?s size, as shown on the table below. The save DCs are Consitution-based.

Size	Fort DC
Huge	14

SEE WIKIPEDIA ENTRY: Snake

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System Reference Document -> List of Creatures (SRD)