[Ghoulish Delight]

So, one expert says that this kind of vicious attack is very rare for chimps, that they don't go beyond minor biting unless its over something major, like territory. Now, the background is that one chimp (Moe, who did not attack and remained in his cage) used to be owned by the guy who got attacked, but was confiscated and relocated to this sanctuary. The victim regularly visited Moe and, this time, was giving Moe a birthday cake. My completely amateur, uneducated, uninformed guess is that the other chimps were ticked off at the ammount of attention Moe got from this guy, possibly Moe was low in the social order and the guy was breaking major protocol by giving attention and gifts to Moe.