You were taught a style of martial arts that relies on your natural weapons.
Prerequisites
Improved Unarmed Strike, Weapon Focus with selected natural weapon.
Benefit
Choose one of your natural weapons. While using the selected natural weapon, you can apply the effects of feats that have Improved Unarmed Strike as a prerequisite as if your natural weapon were an unarmed strike.
Special
If you are a monk, your selected natural weapon gains the Ki Focus special ability.