Vermin Shape II

This spell functions as vermin shape I, except it also allows you to assume the form of a Tiny or Large creature of the vermin type. If the form you assume has any of the following abilities, you gain the listed ability: burrow 30 feet, climb 60 feet, fly 60 feet (good maneuverability), swim 60 feet, darkvision 60 feet, low-light vision, tremorsense 30 feet, scent, blood drain, constrict, grab, lunge, poison, pull, trample, and web. You don't gain full immunity to mind-affecting effects, but you do gain a +4 bonus on all saving throws against such effects.

Tiny verminIf you take the form of a Tiny vermin, you gain a +4 size bonus to your Dexterity, a –2 penalty to your Strength, and a +1 natural armor bonus.

Large verminIf you take the form of a Large vermin, you gain a +4 size bonus to your Strength, a –2 penalty to your Dexterity, and a +5 natural armor bonus.