SRD:Medium Viper

=SNAKE, MEDIUM VIPER=

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.

Combat
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 Constitution-based.

See Wikipedia Entry: Snake

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