Snail and Slug Welfare in Agriculture

Snails and slugs are significant agricultural pests managed through chemical and physical control methods, with emerging questions about their capacity for pain and the welfare implications of mass pesticide killing.

Key Facts

Metaldehyde slug pellets, which cause slugs to desiccate slowly, were banned in Great Britain in 2022 due to environmental harm
Ferric phosphate slug pellets are considered less environmentally harmful but their welfare impact on slugs is less well studied
Molluscs including snails and slugs have nervous systems capable of nociception, though their capacity for subjective suffering is uncertain
Physical exclusion methods including copper tape and barriers provide welfare-neutral alternatives to chemical control in some contexts
Slug populations are important food sources for ground-feeding birds including song thrushes, hedgehogs and ground beetles

Welfare Considerations

Slug and snail welfare is at the frontier of invertebrate welfare consideration. Molluscs have nociceptors and produce defensive responses to harmful stimuli, but the question of whether they experience subjective suffering is scientifically unresolved. The precautionary principle suggests that this uncertainty warrants consideration of control methods that minimise potential harm. The ban on metaldehyde pellets that cause slow desiccation removes one of the least defensible pest control methods on welfare grounds. Ferric phosphate affects iron metabolism but the welfare experience is unclear. Biological control using parasitic nematodes and physical exclusion methods provide alternatives for concerned growers and gardeners.

What You Can Do

Avoid slug pellets in your garden and use physical exclusion methods or habitat management instead
Support wildlife that controls slug populations naturally including song thrushes, hedgehogs and ground beetles
Choose gardening products that do not contain metaldehyde or other toxic molluscicides
Engage with the emerging science of mollusc welfare and apply precautionary reasoning to your practice
Advocate for welfare consideration of invertebrate pest control methods in agricultural policy