Bumblebee populations are declining across the world due to pesticide exposure, habitat loss, and disease. While insect sentience remains uncertain, the scale of harm and their ecological importance warrant welfare consideration.
Bumblebee welfare is scientifically uncertain but the precautionary principle and scale of impact warrant attention. Research showing that bees exhibit pessimistic cognitive bias under stress — analogous to anxiety in vertebrates — suggests they may experience states relevant to welfare. Neonicotinoid exposure causes disorientation and foraging failure that likely involves distress. Commercial hive disease spread has devastated wild populations with unknown individual suffering. Regardless of the sentience question, the ecological services bees provide and the scale of mortality make pesticide reduction an important conservation and potential welfare intervention.