LordVyreth said:
I'm sure this one has been asked a lot, but I haven't had to deal with it as a DM an a 3.5 environment yet, and it may come up soon. What's the official ruling on how monks can use natural attacks? Are they completely incompatible with the unarmed strike damage and flurry of blows, or can some of them officially be used as secondary attacks? What's the official ruling, and have you done it at all differently?
An unarmed strike is treated by the rules (in nearly all cases) as a manufactured weapon.
Thus, like any other manufactured weapon, it can be mixed with natural weapons following the rules on mixing them (chiefly, natural weapons become secondary, taking a -5 penalty on attack rolls and applying only x.5 Str bonus to damage). The only important difference between a creature with a sword and a bite and a creature with an unarmed strike and a bite is flavor text. In fact, if he wanted to, the creature with the sword and the bite could use TWF rules to attack with his sword and his US (which every creature has), and then use his bite, anyway.
Monks have a special ability called Flurry of Blows. FoB requires you to take the Full Attack action and then modifies it, just like Whirlwind Attack does. WWA lets you make 1 attack at your highest BAB against each opponent within reach. To do so, you give up any bonus or extra attacks you might otherwise be entitled to (TWF, Cleave, Haste, etc.).
FoB gives you one or more extra attacks at your highest BAB (possibly with a penalty) in addition to allowing you to make your normal Full Attack routine. To do so, you give up the ability to use any weapon other than an unarmed strike or special monk weapon. Natural weapons - claws, bites, tailslaps, etc. - are not on the list as special monk weapons. Accordingly, during the Full Attack action in which the monk is benefitting from FoB, he or she may not use natural weapons. Similarly, a monk may not use both FoB and TWF with a dagger; the dagger is not a special monk weapon.