Source: Dragon #329
You have more in common with beasts than you do with your own race.
Prerequisite: Wild empathy.
Benefit: You are vulnerable to the following list of spells that affect animals, as well as those which affect your own creature type: animal trance, calm animals, charm animal, dominate animal, hide from animals, hold animal. Additionally, you suffer a -2 penalty on all Charisma-based skill checks except Disguise, Handle Animal, and Use Magic Device. Anyone observing your mannerisms who possesses the wild empathy class ability can recognize this flaw immediately.