Wild Slow Worm Conservation and Welfare

Slow worms are legless lizards (not snakes) that are common but declining in UK gardens and countryside. Their welfare and conservation benefits from understanding their specific ecological needs.

Key Facts

Slow worms (Anguis fragilis) are legless lizards, not snakes - they have eyelids and can shed their tails as a defence mechanism
They are fully protected under the Wildlife and Countryside Act 1981 - killing or disturbing them is illegal
UK populations are estimated in the millions but have declined significantly from pesticide use, predation, and habitat loss
Slow worms are viviparous - females give birth to 6-12 live young in late summer
They are beneficial to gardeners, feeding almost exclusively on slugs, snails, and earthworms
Compost heaps, refugia (corrugated tin or black polythene on the ground), and rough grass areas provide essential habitat
Garden pesticides and slug pellets (metaldehyde) reduce their prey base and may cause direct poisoning
Cats and garden machinery (strimmers, lawnmowers) are significant mortality causes in garden populations

Welfare Considerations

Slow worm welfare in gardens is primarily threatened by human management practices. Strimmering rough vegetation without survey removes individuals unable to escape rapidly. Garden machinery during mowing kills slow worms sheltering in grass. Cat predation, while typically not fatal due to taste rejection after initial capture, causes significant stress and injury. Pesticides and slug pellets reduce the prey base that slow worms depend on. The welfare-positive garden for slow worms is rough, chemical-free, with areas of permanent cover and reduced disturbance - precisely the management approach that benefits multiple other species and supports garden biodiversity generally.

What You Can Do

Create slow worm refugia using sections of corrugated roofing iron or black polythene on the ground in a quiet garden area
Survey rough grass areas before strimmering - slowly walk ahead of the machine to flush slow worms
Avoid pesticides and slug pellets - both reduce slow worm prey and may directly harm them
Keep cats supervised or use cat bibs to reduce slow worm predation
Report slow worm sightings to ARG UK to contribute to population monitoring
Maintain compost heaps and log piles which provide warm refugia and breeding habitat