You gain the following statistics and abilities regardless of which battle form you choose:
Your battleform is Large and your attacks have 10-foot reach.
AC = 18 + your level. Ignore your armor's check penalty and Speed reduction.
15 temporary Hit Points.
Low-light vision and imprecise scent 30 feet.
One or more unarmed melee attacks specific to the battle form you choose, which are the only attacks you can use. You're trained with them. Your attack modifier is +16, and your damage bonus is +9. These attacks are Strength based (for the purpose of the enfeebled condition, for example). If your unarmed attack bonus is higher, you can use it instead.
Athletics modifier of +16, unless your own modifier is higher.
You also gain specific abilities based on the type of animal you choose:
Ape Speed 25 feet, climb Speed 20 feet; Melee Single Action fist, Damage 2d6 bludgeoning.
Bear Speed 30 feet; Melee Single Action jaws, Damage 2d8 piercing; Melee Single Action claw (agile), Damage 1d8 slashing.
Bull Speed 30 feet; Melee Single Action horn, Damage 2d8 piercing.
Canine Speed 40 feet; Melee Single Action jaws, Damage 2d8 piercing.
Cat Speed 40 feet; Melee Single Action jaws, Damage 2d6 piercing; Melee Single Action claw (agile), Damage 1d10 slashing.
Deer Speed 50 feet; Melee Single Action antler, Damage 2d6 piercing.
Frog Speed 25 feet, swim Speed 25 feet; Melee Single Action jaws, Damage 2d6 bludgeoning; Melee Single Action tongue (reach 15 feet), Damage 2d4 bludgeoning.
Shark swim Speed 35 feet; Melee Single Action jaws, Damage 2d8 piercing; breathe underwater but not in air.
Snake Speed 20 feet, climb Speed 20 feet, swim Speed 20 feet; Melee Single Action fangs, Damage 2d4 piercing plus 1d6 poison.