"Animals more obviously violate the concept of goodness, for none can live without tearing and devouring other organiz…"

"Beyond the limits of the most comprehensive actual society are living creatures whom our moral impulse bids us to inc…"

"After long pondering, I believe that I can define good and evil in terms to which even a biologist of the mechanical …"

"I have come to view vegetarianism as a standing protest against predation, which is life's greatest evil. If there we…"

"[Predation is] a great evil that a wise or benevolent creator would have avoided."

"Earth has no more distressing spectacle than that of a predator suddenly striking down some defenseless creature inno…"

"The evolutionary impulsion to increase fecundity, technically known as fitness, at whatever cost is responsible for m…"

"That evolution has accomplished much that is splendid and admirable, it would be ungrateful to deny. That the means i…"

"The wild life of nature, regarded simply as woodland glades, murmuring brooks, fragrant flowers and songful birds, or…"

"Sometimes, especially in inclement weather, incubating birds continue to cover their eggs while hungry, and even when…"