The material below is Open Game Content from a 3PP Source
This spell functions as beast shape I, except that it also allows you to assume the form of a Tiny or Large creature of the animal type. If the form you assume has any of the following abilities, you gain the listed ability: climb 60 feet, fly 60 feet (good maneuverability), swim 60 feet, darkvision 60 feet, low-light vision, scent, grab, pounce, and trip.
Tiny animal: If the form you take is that of a Tiny animal, you gain a +4 size bonus to your Dexterity, a –2 penalty to your Strength, and a +1 natural armor bonus.
Large animal: If the form you take is that of a Large animal, you gain a +4 size bonus to your Strength, a –2 penalty to your Dexterity, and a +4 natural armor bonus.