Adder Conservation and Welfare | Animal Welfare Hub

Britain only venomous snake is in serious decline due to habitat fragmentation, persecution and loss of suitable heathland habitat.

Key Facts

Adder populations have declined by approximately 90% at some sites over recent decades
Heathland, moorland edges and south-facing grassland are key adder habitats
Persecution through deliberate killing remains a significant threat despite legal protection
Disturbance by dog walkers and off-road vehicles at basking sites causes welfare harm
Adders are fully protected under the Wildlife and Countryside Act 1981
Population fragmentation is causing inbreeding depression in isolated populations
Translocations to connect isolated populations have shown some success

Welfare Considerations

Adder welfare is compromised by direct persecution, disturbance and habitat loss. Basking is a physiological necessity for ectotherms - disturbance during basking forces adders back into cover at metabolic cost. Persecution injuries cause pain and death. Declining populations face genetic bottlenecks that impair immune function and reproductive success. Public education about adder behaviour and legal protection is essential for direct welfare improvement.

What You Can Do

Never kill, handle or disturb adders - observe from a distance
Keep dogs under close control in adder habitat, especially during spring basking season
Report adder sightings and suspected persecution to the Amphibian and Reptile Conservation Trust
Support heathland restoration and management projects that benefit adder populations