SRD:Huge Monstrous Scorpion

Huge Monstrous Scorpion
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 Constitution-based. The indicated damage is initial and secondary damage.

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

See Wikipedia Entry: Scorpion