Ancestry, Primal
You can briefly assume the form of a specific tiny animal tied to your ancestry.

When you use Ancestral Pest, you assume the form of a tiny animal, gaining the effect of a 1st‑rank pest form spell. You can only transform into the creature specified for your ancestry’s listing (for example, squox for Eupcura , rat for Urbong). You can use your normal base Speed if it’s higher than the Speed the battle form would grant. If the listed creature is normally larger than Tiny, you instead become a smaller, younger version of that animal in your pest form. If the listed creature usually has a swim Speed, Ancestral Pest gives you a Swim Speed 20 feet while transformed.

Synergy: The Creature Shape feat explicitly upgrades this: if you have Ancestral Pest, you can choose to gain the effects of a 4th‑level pest form via Creature Shape for a stronger, longer‑lasting version.