What happens when a creature with multiple natural
weapons gets to make an attack of opportunity? Does it
have to use its primary natural weapon? What happens if
the creature has a pair of primary weapons, such as a
bear’s two claws.
An attack of opportunity is a single melee attack; no matter
how many weapons or natural weapons the creature making the
attack has available.
When a creature with natural weaponry makes an attack of
opportunity, it can use any natural weapon it has. If it decides
to use a secondary weapon, however, it suffers the usual –5
attack penalty for a secondary attack (or –2 if it has the
Multiattack feat), and it applies only half its Strength bonus on
damage if the attack hits.