Swarmkind Form

As an action, you can magically transform into an animal of the same type as your swarm, allowing you to pose as an innocuous-looking beast such as a lizard, rat, or spider. The beast you choose must be CR 1 or less, and you must change into the same type of beast each time. You remain in your beast form until you fall unconscious or until you use another action to transform back into your true form.

You can’t transform into an animal with a swim speed unless you’re an Aquatic Swarm swarmblood. Similarly, you can’t transform into an animal with a fly speed, unless you also have the Fractal Wings feat.