On the Unarmed page of the wiki it says:
What other "feats that grant bonuses to Unarmed weapons" might work?Driud's natural attacks, while not always bludgoning, are considered unarmed and they also benefit from feats that grant bonuses to Unarmed weapons, such as Weapon Focus:Unarmed (granted by Weapon_Focus:_Bludgeoning).
Would Weapon Specialization add damage to a druid's natural attacks?
I supposed I could, in theory, pick Weapon Specialization: Bludgeoning. Or maybe Improved Critical: Bludgeoning? However, a druid's natural attacks are not always bludgeoning...Weapon Specialization grants a bonus of +2 to damage with the chosen weapon type (thrown, ranged, bludgeoning, piercing or slashing). This feat can be taken multiple times, but only once for each weapon type.