Skeletal Transformation Feat 13
Source Pathfinder Book of the Dead
You rearrange your bones into a bestial shape. Once per day, you can cast Animal Form as a divine innate spell. When you cast it, you choose the spell's level: 3rd, 4th, or 5th. Your battle form looks like a skeletal version of the animal. In this form, you retain the benefits of any skeleton feats that do not require the use of hands or the ability to communicate.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
SkeletonThis undead is made by animating a dead creature's skeleton with negative energy. An ability with this trait can be used or selected only by skeletons.