SFS Standard Ancestral Pest [two-actions] Feat 5

Source Galactic Ancestries pg. 92
You assume the form of a tiny animal, gaining the effect of a 1st-rank pest form, except you can transform only into a creature that matches the listed entry, and you can use your normal base Speed if it's higher than what the battle form grants. If the listed creature is normally larger than Tiny, you transform into a smaller, younger version of the animal. If the listed creature usually has a swim Speed, Ancestral Pest grants you a swim Speed of 20 feet.

Option(s): Otter

Traits

Brenneri:A creature with this trait is a member of the brenneri ancestry. They are friendly otter-like humanoids who can swim and hold their breath for long periods. An ability with this trait can be used or selected only by brenneris.
Primal:This magic comes from the primal tradition, connecting to the natural world and instinct. Anything with this trait is magical.