Invertebrates

Snail and Slug Welfare in Gardens

Common garden snails and slugs are among the most-killed invertebrates globally, through methods whose welfare implications are rarely considered.

Key Facts

Snails and slugs have rudimentary nervous systems but show avoidance learning
They can detect and move away from harmful stimuli
Slug populations can exceed 200 individuals per square meter in optimal habitat
They play important ecological roles as decomposers and prey for birds and hedgehogs
Beer traps and metaldehyde pellets are among the most common control methods

Welfare Considerations

Metaldehyde pellets cause prolonged suffering before death — affected slugs show distress behaviors for hours. Salt application causes immediate tissue damage equivalent to chemical burns. While the capacity for pain in gastropods is scientifically debated, the precautionary principle suggests minimizing methods causing prolonged aversive states. Non-lethal deterrents are available and effective.

What You Can Do

Use copper tape or other physical barriers instead of lethal control methods
If control is needed, choose iron phosphate pellets over metaldehyde
Create hedgehog-friendly gardens to harness natural slug predation
Appreciate the ecological role snails and slugs play in garden ecosystems