The red squirrel (Sciurus vulgaris) was once the only squirrel in Britain but has been largely displaced by the introduced grey squirrel over the past century. Now restricted primarily to Scotland, Northumberland, the Lake District, and a few other refugia, red squirrels require active conservation management that raises both welfare and ecological questions.
The UK red squirrel population has declined from millions to approximately 120,000, of which around 75% are in Scotland. In England, populations survive in Northumberland (approximately 11,000 animals, partly reliant on active management), the Lake District, Formby on Merseyside, and a few other locations. Wales retains a very small population on Anglesey. The species is protected under the Wildlife and Countryside Act 1981, making it illegal to intentionally kill, injure, or take a red squirrel.
Grey squirrels (Sciurus carolinensis) outcompete red squirrels for food resources — their more efficient metabolism allows them to utilise food at lower densities. More significantly, grey squirrels carry squirrelpox virus (SQPV), to which they are largely immune but which causes fatal disease in red squirrels. Where grey squirrels are present, red squirrels typically disappear within 5–15 years through a combination of direct competition and disease.
Grey squirrel control: Active management of grey squirrel populations in buffer zones around red squirrel refugia is the primary conservation intervention. Methods include trapping (cage and Larsen traps), shooting, and — controversial but increasingly discussed — fertility control or targeted lethal agents. Trap-based grey squirrel control reduces SQPV exposure and competitive pressure, demonstrably benefiting red squirrel population stability and growth where implemented consistently.
SQPV vaccination: A vaccine against squirrelpox administered via bait stations provides immune protection to red squirrels. Development and deployment of oral vaccination is an ongoing research priority that would transform conservation feasibility by removing the need for individual capture and vaccination.
Habitat management: Red squirrels have some habitat preference differences from greys — they use conifer woodland more extensively. Managing woodland composition to increase conifer components in red squirrel areas may provide competitive advantage.
Supplementary feeding: Feeding stations provide food during periods of resource scarcity, improve body condition, and provide opportunities for population monitoring and vaccination delivery.
Grey squirrel control programmes require welfare consideration in their design. Spring traps used without proper training and checking frequency cause suffering. Training for those involved in control operations, compliance with current best practice, and regular trap inspection are welfare obligations. Red squirrel supplementary feeding and trapping for vaccination also involve welfare considerations that require careful technique to minimise stress.
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