The hazel dormouse is one of Britain most endearing small mammals, yet it has declined by approximately 70% since 2000. Its dependence on ancient woodland and hedgerow connectivity makes it highly vulnerable to habitat fragmentation.
Dormouse welfare is primarily a habitat and connectivity issue. Isolated dormouse populations in woodland fragments show reduced genetic diversity, higher stress indicators, and lower reproductive success than connected populations. The welfare of individual dormice during research handling requires specialist licensing and training — their small size and hibernation physiology make handling particularly stressful. Development impacts on dormouse habitat require mitigation planning that genuinely compensates for connectivity loss rather than merely providing new habitat fragments that may not be functionally connected to source populations.