Hazel dormouse populations have plummeted by almost 60% since 2000, a staggering average annual decline of 3.5%.
Despite a recent uptick in numbers, the species remains a shadow of its former self, having vanished from roughly 20 English counties as woodland habitats have been stripped away.
The National Dormouse Monitoring Programme, spearheaded by the People’s Trust for Endangered Species (PTES), has tracked these rodents across England and Wales since 1998. Once a common sight, the dormouse is now largely confined to southern England and pockets of Wales. Even with current growth, populations are significantly lower than historical baselines.
The hazel dormouse is a creature of deep slumber, traditionally hibernating in ground-level nests from October through May. Yet, these rodents also utilize “torpor”—a state of deep sleep triggered by cold, wet weather or food scarcity. Scientists now suggest that warmer summers are effectively shortening these periods of dormancy.
By spending less time in torpor, dormice have more energy to hunt for insects, berries, nuts, and flowers. Dr. Charlotte Armitage, an ecologist involved in the survey, suggests this increased activity may allow the animals to reproduce more frequently and raise additional litters. Still, experts urge caution, noting that these estimates are shrouded in uncertainty.
While the recent data offers a glimmer of hope, the path forward is complex. Questions loom over how the species will fare against warmer, wetter winters. For conservationists, the primary mission remains the preservation of safe, well-managed woodland.
Dr Armitage told BBC News that while findings are encouraging, constant vigilance and continued conservation efforts are the only way to ensure the species’ ongoing recovery.
