You can briefly transform yourself into a second form, acquiring its physical qualities.

Prerequisite
Exposure to alter self spell.
Benefit

Choose one specific form that you’ve turned yourself into with the alter self spell. Once per day, you can use alter self as a spell-like ability to turn yourself into this form for 1 minute.
Special

You can gain Momentary Alteration multiple times. Each time you take the feat, you can either extend the duration of an already chosen alternate form by 1 minute or choose another specific form from among those you’ve experienced after casting alter self on yourself.