Even animals have a conscience. Those in the jungle KILL only to eat, not live to kill. This is why we often see packs of predators focusing on just one kill, instead of targeting many. Even animals exercise reason. I have seen a mother lion taking care of a baby antelope, and a mother elephant taking care of a baby lion. The primal need to eat is unavoidable, yet even under severe hunger stretches, the desire to love can sometimes overcome the desire to eat.