Multiattack
In addition to its standard melee or ranged attack, the creature has a multiattack entry. When making a full attack, the creature can make all the attacks listed in the multiattack entry at the attack bonuses listed, rather than make two attacks. It can make the attacks in any order.
Format: Multiattack bite +10 (1d4+11), 2 claws +10 (1d4+11).
Guidelines: Use the appropriate damage column for the creature’s array for all attacks in the multiattack, and impose a –6 penalty on these attacks (rather than the usual –4 penalty for a full attack).
Source
Alien Archive pg. 155