Lepidoptera — moths and butterflies — face severe habitat losses and population declines. Whether they experience welfare in a morally relevant sense is debated, but their conservation matters for ecosystems and potentially for themselves.
The welfare question for butterflies and moths is genuinely uncertain: their nervous systems are simpler than vertebrates, but not absent, and some evidence suggests basic forms of learning and preference. The ecological welfare argument is clearer — butterflies and moths support entire communities of predators and plants that depend on them for pollination. Their decline represents a welfare crisis for the vertebrate species that eat them, even before individual lepidopteran welfare is considered. For conservation purposes, the most important actions are habitat protection, pesticide reduction, and restoration of wildflower meadows and woodland edges that caterpillars and adults require. Gardens managed for butterflies and moths contribute meaningfully to population support.