I've always thought that a creature with natural weapons could make all of his primary attacks as a partial action. A carrion crawler, for example, could move and make all 8 tentacle attacks. An achaieri (2 Claws, Bite) could make both claw attacks and still move but not the bite.
I can't find the rule that mentions that. Am I making it up?
I can't find the rule that mentions that. Am I making it up?