Snakes usually are not aggressive and flee when confronted.
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.

• Snake, Constrictor
  
• Snake, Giant Constrictor
  
• Snake, Tiny Viper
  
• Snake, Small Viper
  
• Snake, Medium Viper
  
• Snake, Large Viper
  
• Snake, Huge Viper
  

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System Reference Document -> List of Creatures (SRD)