Insect Welfare: Evidence and Ethical Considerations

Insects represent the vast majority of animals on Earth by number. Growing evidence of nociception and potentially pain-like states in some insect species is prompting scientists and ethicists to reconsider their moral status.

Key Facts

Insects comprise approximately 80% of all animal species and outnumber humans by approximately 1.4 billion to one
Bees show learned avoidance of noxious stimuli and pessimistic cognitive biases after aversive experiences
Fruit flies show wound-sensitisation, reduced by analgesics, suggesting nociception and potentially pain-like states
Insect nociceptors and opioid-like systems have been identified, though their functional role remains debated
Some countries including Switzerland and New Zealand have legal protections for decapod crustaceans but not insects
Insect farming for food produces enormous numbers of animals under conditions whose welfare implications are unknown
The moral status of insects is genuinely uncertain — this uncertainty itself has ethical implications for treatment

Welfare Considerations

The welfare status of insects is one of the most important and contested questions in animal ethics. The sheer scale of insect numbers means that even a small probability of suffering-capable states in insects would represent enormous moral weight. The precautionary principle suggests treating insects with some degree of moral consideration even under uncertainty. Practical implications include using more humane methods in insect farming, reducing unnecessary insect killing, and supporting research that better characterises the nature of insect nociception and potential pain experience.

What You Can Do

Support research by the insect welfare programme at the Rethink Priorities organisation
Apply precautionary consideration to insect welfare decisions, particularly at scale in farming contexts
Advocate for insect welfare research to be included in animal welfare science funding priorities
When insect control is necessary, use the most targeted and humane methods available
Support policy discussions about the appropriate moral and legal status of insects as evidence accumulates