Explore the choices, costs, and conservation tools that could return the red squirrel to more of England's woodlands
The red squirrel (Sciurus vulgaris) has retreated from most of its historic range in Great Britain, a loss that conservationists describe as dramatic and recent in ecological terms. Once common across woodlands, the species now survives in fragmented pockets, mainly in northern England and on islands such as the Isle of Wight and around Poole Harbour.
Current estimates put the England population at about 38,900 individuals (Mathews et al, 2018), and the species is listed as endangered on Britain’s red list for terrestrial mammals (Mathews et al, 2026). These facts set the stage for a national effort to assess options for recovery.
Natural England commissioned the Zoological Society of London to develop an evidence-led recovery strategy that diagnoses the main pressures on red squirrels and compares realistic pathways to restoration. The review synthesises biological drivers, social considerations and practical interventions so decision-makers can weigh outcomes and trade-offs.
This article summarises that analysis and explains what it implies for conservation planning across England.
Drivers of decline
The arrival and expansion of the grey squirrel (Sciurus carolinensis) is central to the red squirrel’s collapse. Introduced from North America beginning in 1876, the grey competes for food and habitat and is a reservoir for the squirrelpox virus, which is typically fatal to red squirrels but not to greys. Beyond species interactions, long-term range contraction has been exacerbated by woodland loss, fragmentation and the formation of small, isolated populations that can suffer reduced genetic fitness and local extinctions. Together, these pressures have produced a steep geographic retreat that conservationists now aim to reverse.
The structured planning process
Starting with pilot workshops in 2026, the strategy employed a structured decision-making framework to compare options transparently. Over 60 stakeholders participated in workshops and webinars to identify feasible interventions and societal concerns. The resulting model integrated ecological dynamics (such as disease transmission and competition), management actions (including control and translocation), and non-biological factors like costs, animal welfare and public acceptance. That multi-dimensional approach allowed assessment of combined tactics rather than single measures in isolation.
Options evaluated
The analysis tested 18 alternative packages that mixed different intensities and combinations of interventions. These included sustained grey squirrel suppression at landscape scales, targeted local control linked to red squirrel translocations, and emerging tools such as fertility control and the development of a potential squirrelpox vaccine. Each option was evaluated at regional and national scales to show how ambition, coordination and investment shape chances of long-term persistence for red squirrels in England.
How outcomes were modelled
The modelling explored biological responses and practical constraints to give a realistic picture of trade-offs. Scenarios accounted for differences in cost, expected welfare implications, logistical feasibility and the timeframes for seeing population benefits. By doing so, the work made explicit which strategies deliver the greatest ecological gains, which offer cost-effective regional solutions, and which paths are unlikely to prevent further decline under present effort levels.
Key findings and implications
Three clear themes emerged. First, very large-scale, coordinated grey squirrel suppression across England provides the highest probability of widespread red squirrel recovery and would reduce the substantial ecological and economic impacts associated with greys (estimated at about £37 million per annum in England and Wales). Second, ambitious national control is the most expensive and raises the greatest animal welfare concerns, making it politically and practically challenging. Third, regional programmes that combine localised grey control with planned red squirrel translocations can achieve durable outcomes at lower cost and with fewer welfare issues, offering a pragmatic intermediate route.
Importantly, the strategy showed that continuing current levels of management is unlikely to halt the decline: under a minimal intervention scenario, red squirrels are projected to vanish from mainland England within the next 25 years. That stark projection reinforces the need for choices about scale, funding and societal acceptability if recovery is to be possible.
Moving from evidence to action
The report gives conservation bodies and policymakers a transparent assessment of the trade-offs involved in red squirrel recovery. It highlights that success depends not only on biological effectiveness but on public support, funding, and careful handling of welfare concerns. The full Red Squirrel Recovery Strategy is available through the Natural England Access to Evidence website, where practitioners can review scenario outputs and implementation pathways.
Restoring the red squirrel to more of England’s woodlands is achievable, but it requires coordinated planning that balances ecological ambition with economic realities and social values. By clarifying options and consequences, the strategy provides a practical foundation for decisions that could re-establish this cherished native species across larger parts of England.
