I think he overlook a phase: that empathy stage in our lives when we may begin to see even the commonest animals on their own terms, fellow creatures with their own needs to meet and hardships to bear, joined with us in the mystery of life and death--and frankly, for all of our more exalted endowments, not all that much less enlightened than the sagest of naked apes about the meaning of it all. That kinship is to me reason enough to go about my own way in the world showing each one as much courtesy as I can, refraining from things that bring animals needless harm. They all seem to have enough dangers coming at them as it is. Whenever human beings with our loftier gifts and grander calling in the world can stop to think on their well-being, if only by withdrawing to let them be, it need not be a recognition of 'rights.' It is just a gracious thing, an act of clemency only more to our credit because the animals themselves cannot ask for it, or rebuke us when we transgress against them, or even repay our kindness.