"It seems, moreover, that my argument has some relevance to choices we must make even now. There are some species of large predatory animals, such as the Siberian tiger, that are currently on the verge of extinction. If we do nothing to preserve it, the Siberian tiger as a species may soon become extinct. The number of extant Siberian tigers has been low for a considerable period. Any ecological disruption occasioned by their dwindling numbers has largely already occurred or is already occurring. If their number in the wild declines from several hundred to zero, the impact of their disappearance on the ecology of the region will be almost negligible. Suppose, however, that we could repopulate their former wide-ranging habitat with as many Siberian tigers as there were during the period in which they flourished in their greatest numbers, and that that population could be sustained indefinitely. That would mean that herbivorous animals in the extensive repopulated area would again, and for the indefinite future, live in fear and that an incalculable number would die in terror and agony while being devoured by a tiger. In a case such as this, we may actually face the kind of dilemma I called attention to in my article, in which there is a conflict between the value of preserving existing species and the value of preventing suffering and early death for an enormously large number of animals."