Insect populations are declining catastrophically worldwide; whether insects experience suffering remains uncertain, but the scale of their decline warrants welfare consideration alongside ecological concern.
Insect welfare science is at an early stage. Evidence from bees and fruit flies suggests capacity for nociceptive responses, associative learning, and even mood states. Whether these constitute morally significant suffering in a philosophically meaningful sense is unresolved. However, the precautionary principle — and the sheer scale of insect mortality from pesticides, which cause muscular convulsions and prolonged incapacitation — suggests that reducing likely suffering while also addressing the ecological crisis of insect decline serves multiple goals simultaneously. Reducing pesticide use, particularly neonicotinoids that cause sublethal behavioural impairment in bees, addresses both welfare and conservation concerns.