When you cast this spell, you can assume the form of any Small or Medium creature of the animal type. If the form you assume has any of the following abilities, you gain the listed ability: climb 30 feet, fly 30 feet (average maneuverability), swim 30 feet, darkvision 60 feet, low-light vision, and scent.

Small animal: If the form you take is that of a Small animal, you gain a +2 size bonus to your Dexterity and a +1 natural armor bonus.

Medium animal: If the form you take is that of a Medium animal, you gain a +2 size bonus to your Strength and a +2 natural armor bonus.

Beast Shape II

School transmutation (polymorph); Level sorcerer/wizard 4

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.

Beast Shape III

School transmutation (polymorph); Level sorcerer/wizard 5

This spell functions as beast shape II, except that it also allows you to assume the form of a Diminutive or Huge creature of the animal type. This spell also allows you to take on the form of a Small or Medium creature of the magical beast type. If the form you assume has any of the following abilities, you gain the listed ability: burrow 30 feet, climb 90 feet, fly 90 feet (good maneuverability), swim 90 feet, blindsense 30 feet, darkvision 60 feet, low-light vision, scent, constrict, ferocity, grab, jet, poison, pounce, rake, trample, trip, and web.

Diminutive animal: If the form you take is that of a Diminutive animal, you gain a +6 size bonus to your Dexterity, a -4 penalty to your Strength, and a +1 natural armor bonus.

Huge animal: If the form you take is that of a Huge animal, you gain a +6 size bonus to your Strength, a -4 penalty to your Dexterity, and a +6 natural armor bonus.

Small magical beast: If the form you take is that of a Small magical beast, you gain a +4 size bonus to your Dexterity, and a +2 natural armor bonus.

Medium magical beast: If the form you take is that of a Medium magical beast, you gain a +4 size bonus to your Strength, and a +4 natural armor bonus.

Beast Shape IV

School transmutation (polymorph); Level sorcerer/wizard 6

This spell functions as beast shape III except that it also allows you to assume the form of a Tiny or Large creature of the magical beast type. If the form you assume has any of the following abilities, you gain the listed ability: burrow 60 feet, climb 90 feet, fly 120 feet (good maneuverability), swim 120 feet, blindsense 60 feet, darkvision 90 feet, low-light vision, scent, tremorsense 60 feet, breath weapon, constrict, ferocity, grab, jet, poison, pounce, rake, rend, roar, spikes, trample, trip, and web. If the creature has immunity or resistance to any elements, you gain resistance 20 to those elements. If the creature has vulnerability to an element, you gain that vulnerability.

Tiny magical beast: If the form you take is that of a Tiny magical beast, you gain a -2 penalty to your Strength, a +8 size bonus to your Dexterity, and a +3 natural armor bonus.

Large magical beast: If the form you take is that of a Large magical beast, you gain a +6 size bonus to your Strength, a -2 penalty on your Dexterity, a +2 size bonus to your Constitution, and a +6 natural armor bonus.