Class-Based Natural Weapons & Proficiency

[Muzzy]

The CRB says this about Natural Weapons:

CRB wrote:

All characters are proficient with unarmed strikes and any natural weapons they gain from their race. A character who uses a weapon with which he is not proficient takes a –4 penalty on attack rolls with that weapon.

But I am unable to find any rules regarding proficiency of natural weapons as the result of class features such as the Alchemist's Feral Mutagen, the Barbarian's Beast Totem, multiple Sorcerer's Bloodline Powers, etc.

It seems that, RAW, any character using natural weapons they receive as the result of a class feature would have to take a -4 penalty to attack rolls. The only class which is an exception to this is the Druid class which has proficiency with all natural weapons.

Is my interpretation of the rules correct?

[Rikkan]

Core rulebook FAQ

Quote:

Natural Attacks: Am I proficient in my natural attacks?

Yes. Whether you get those natural attacks from your race (as stated in the Bestiary entry on natural attacks), your class (as stated in the druid proficiency list), a polymorph effect (as stated in the Magic chapter), or any other source (such as an alchemist's feral mutagen), you are proficient in your natural attacks.

[Muzzy]

Awesome. Thank you.