"When we try to use psychologically based ethics to protect the flora or even the insentient fauna, to protect endangered species or ecosystems, we can only stammer. Wild nature is prolific, but not very compassionate, and what does it mean to respect life at the same time that we value natural processes? A bison fell through the ice into a river in Yellowstone Park; the environmental ethics there, letting nature take its course, forbade would-be rescuers from either saving or mercy killing the suffering animal. When the bighorn sheep of Yellowstone caught pinkeye, were blinded, injured, and starving as a result, 300 bighorns perished, over half the herd. Wildlife veterinarians wanted to treat the disease, but the Yellowstone ethicists left them to suffer, seemingly not respecting their life. Had they no mercy? No respect for life?"