Natural environments involve substantial animal suffering from predation, disease, parasitism, and starvation — a reality that complicates simple nature-is-good assumptions.
The recognition that wild animals suffer extensively from natural causes challenges the assumption that human intervention is always the source of animal welfare problems. Most individual wild animals live short lives ending in suffering. This does not imply that humans should intervene in all natural processes, but it does suggest that the welfare of wild animals deserves moral consideration beyond simply protecting them from human harm.