Hazel dormice are a native rodent to the UK and are the only one with a distinctive furry tail, and while they can live in many habitats, they favour woodlands and hedgerows.
However, the dormouse population has declined by 70% nationally since 2000, and the species is now extinct in 20 English counties, according to a 2023 report.
In a statement on social media, the trust said: “This milestone is not just a win for conservation but a real testament to the dedication and hard work of everyone involved in their release and ongoing monitoring.