"he claim that suffering is bad for those who experience it and thus ought in general to be prevented when possible cannot be seriously doubted."

“Suppose that we could arrange the gradual extinction of carnivorous species, replacing them with new herbivorous ones. Or suppose that we could intervene genetically, so that currently carnivorous species would gradually evolve into herbivorous ones, thereby fulfilling Isaiah's prophecy. If we could bring about the end of predation by one or the other of these means at little cost to ourselves, ought we to do it?”

“Personal website. Includes list of publications.”

“The suffering that animals undergo while being caught and eaten may be intense and the process by which they are killed may last for a quarter of an hour or more. Because the number of predators worldwide is enormous, and because, like us, many of them must eat with considerable frequency, the aggregate amount of suffering in the world at any time that is caused by predation is unimaginably vast.”

“Viewed from a distance, the natural world often presents a vista of sublime, majestic placidity. Yet beneath the foliage and hidden from the distant eye, a vast, unceasing slaughter rages. Wherever there is animal life, predators are stalking, chasing, capturing, killing, and devouring their prey. Agonized suffering and violent death are ubiquitous and continuous.”

“Introduction to the work of Jeff McMahan. By Lucia Sommer.”

“Jeff McMahan on Killing in War. An interview for Philosophy Bites, 21 Nov. 2009”