Monarch butterfly populations have declined by over 80% due to milkweed habitat loss, pesticide exposure, and climate change, raising questions about insect welfare at population scale.
Whether insects like monarchs experience suffering in a morally significant way remains scientifically uncertain, but the precautionary approach to insect welfare suggests that population-scale harm from habitat loss, pesticide poisoning, and climate disruption warrants concern. Monarch conservation efforts provide clear benefits regardless of the resolution of the consciousness question - they preserve biodiversity, ecosystem services, and the functional capacity of migratory pollinator networks that support broader animal and human welfare.