Squirrel Wars: Contraceptive Bait to Save Britain's Reds

A groundbreaking conservation effort is underway in Britain to protect its dwindling red squirrel population. Researchers have developed a potent contraceptive bait, disguised in hazelnut butter, specifically targeting the larger American grey squirrels that have displaced native reds. These grey squirrels, introduced in the late 19th century, now number at least 2.5 million, compared to an estimated 39,000 red squirrels. The bait is delivered through ingenious feeders that only open for heavier squirrels, ensuring 90% of adult greys can access it while red squirrels remain unaffected.

This humane strategy aims to reduce grey squirrel numbers without resorting to lethal culling, which has proven expensive and less effective. The initiative is backed by a £4.9 million grant from the National Lottery, set to fund a five-year master plan. Public participation is crucial, with citizens encouraged to report squirrel sightings via a dedicated app to aid the project's data collection and surveillance operations.

Conservationists had warned that red squirrels could vanish from most of England and Wales within a decade without intervention. The success of this contraceptive bait and feeder system will be vital for the species' survival. Britain faces significant biodiversity loss, with 88% of Britons expressing concern. This project is among 26 conservation schemes vying for the Great British Wildlife Restoration Award, with results expected in early 2026.