Red squirrels cling to survival in parts of Scotland, northern England, Wales, and Ireland. Squirrelpox virus, spread by the carrier grey squirrel, poses a fatal disease threat and creates a complex welfare challenge for conservation managers.
Key Facts
Red squirrel (Sciurus vulgaris) populations in England and Wales have been reduced to small pockets totalling perhaps 15,000 individuals
Scotland holds approximately 75% of the UK red squirrel population at around 120,000 individuals
Squirrelpox virus is carried asymptomatically by grey squirrels but causes fatal disease in red squirrels within weeks of exposure
Red squirrels that contract squirrelpox develop skin lesions, scabbing, and eye discharge before death
Grey squirrel management through humane trapping is a key element of red squirrel conservation in buffer zones
Immunocontraception vaccines for grey squirrels are being developed as a non-lethal management option
A squirrelpox vaccine for red squirrels has been under development and deployed in trials in Northumberland
Red Squirrel Survival Trust coordinates conservation across multiple reserves and buffer zones
Welfare Considerations
Red squirrel conservation creates a genuine welfare dilemma. Individual red squirrels that contract squirrelpox experience disease-related suffering before death - a welfare harm that conservation managers seek to prevent through grey squirrel control. However, grey squirrel control through trapping and killing imposes welfare costs on individual grey squirrels. The welfare calculus depends on scale: grey squirrel populations number in the millions, while red squirrel populations are tiny and regionally isolated. The development of oral contraceptive vaccines for grey squirrels offers a potential non-lethal management tool that would reduce the welfare costs of conservation management while maintaining population control. Squirrelpox vaccination for red squirrels similarly reduces individual welfare harm from disease.
What You Can Do
Support Red Squirrel Survival Trust, Wildlife Trusts, and regional red squirrel groups in conservation work
Report red squirrel sightings in unfamiliar locations - they may indicate range expansion or release
Support research into grey squirrel immunocontraception and red squirrel pox vaccination programmes
Donate to red squirrel conservation charities working on buffer zone management
Plant hazel, beech, and Scots pine - preferred red squirrel food species - in suitable locations
Engage with the controversy around grey squirrel management to understand the conservation-welfare trade-offs