UK dormouse population shows recovery between 2020-2025
Data from the National Dormouse Monitoring Programme shows hazel dormouse numbers in England and Wales grew by nearly 10% from 2020 to 2025 after a sharp decline.
Stock photo for illustration only, not from the actual event
- Hazel dormouse numbers increased by nearly 10% between 2020-2025
- The period coincided with warmer and drier springs and summers
- Populations had dropped by almost 60% and vanished from 20 English counties since 2000
- Conservationists emphasize ongoing habitat protection remains vital
Dormouse numbers across England and Wales are showing signs of an unexpected rebound, offering a rare glimmer of hope for one of Britain's most cherished mammals. The species has historically vanished from large parts of the countryside as natural woodlands and hedgerows continue to disappear.
Fresh monitoring data indicates that the population grew between 2020 and 2025, a timeframe marked by warmer and drier spring and summer seasons than average. Researchers suggest these favorable environmental conditions have helped the small rodents secure more food supplies and spend less time asleep.
Stock photo for illustration only, not from the actual event
This dynamic grants the animals additional opportunities to breed and accumulate vital fat reserves ahead of the harsh winter months. The hazel dormouse, which represents the sole dormouse species native to the UK, typically spends the majority of the year hibernating from October through May inside ground-level nests.
Furthermore, even during spring and summer, dormice can enter brief periods of deep sleep known as torpor whenever weather conditions turn cold and wet or food becomes scarce. Scientists believe that elevated summer temperatures have curbed the necessity for torpor, leaving the creatures with surplus energy directed toward feeding and reproduction.
While global warming frequently presents severe ecological threats, this specific case highlights how nuanced microclimate shifts can temporarily alleviate food stress for hibernating mammals. Nevertheless, researchers caution that future climate scenarios involving warmer and wetter winters introduce new uncertainties regarding how these animals will manage their hibernation cycles.
The National Dormouse Monitoring Programme, managed by the conservation charity People's Trust for Endangered Species (PTES), has tracked survey sites across England and Wales since 1998. Findings reveal that since 2000, dormouse numbers plummeted by nearly 60 percent, marking an average yearly decline of 3.5 percent alongside local extinctions across roughly 20 English counties.
"We still need to protect their habitat, do more research into the effects of climate change and carry out effective woodland management for the benefit of dormice."
Dr Charlotte Armitage, Ecologist
Source: BBC Science & Environment
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