Trickster Tengu Feat 17
Source Pathfinder Lost Omens: Ancestry Guide
You can transform yourself or the bodies of others to express your displeasure. Once per day, you can cast either Aerial Form or Baleful Polymorph as a 7th-level primal innate spell. You must take the form of a bird when using this aerial form.
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.
TenguA creature with this trait is a member of the tengu ancestry. Tengus are humanoids who resemble birds. An ability with this trait can be used or selected only by tengus. An item with this trait is created and used by tengus.