Monstrous scorpions are likely to attack any creature that approaches, and they usually charge when attacking prey.
Constrict (Ex): A monstrous scorpion deals automatic claw damage on a successful grapple check.
Improved Grab (Ex): To use this ability, a monstrous scorpion must hit with a claw attack. A monstrous scorpion can use either its Strength modifier or Dexterity modifier for grapple checks, whichever is better.
Poison (Ex): A monstrous scorpion has a poisonous sting. The details vary by the scorpion?s size, as follows. The save DCs are Consitution- based. The indicated damage is initial and secondary damage.

Size	Fort DC	Damage
Tiny	12	1 Con

Skills: A monstrous scorpion has a +4 racial bonus on Climb, Hide, and Spot checks.
SEE WIKIPEDIA ENTRY: Scorpion

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System Reference Document -> List of Creatures (SRD)