The question of a right to life in animal ethics.

In animal ethics a Right to Life has been postulated repeatedly, but no valid argument has been produced yet. Thus the question of a Right to Life in animal ethics remains unanswered. It is remarkable that no philosopher has yet found a valid argument against Epicurus (there is nothing fearful in the absence of life). On the other hand, there is, again based upon Epicurus' argument, a basic moral duty with respect to painless killing (i.e. no fear, no distress, no suffering).