The hazel dormouse is one of Britains most threatened small mammals, dependent on traditionally managed coppice woodland that has declined by 90% since the Victorian era.
Dormice in fragmented woodland patches face isolation stress and reduced hibernation condition due to food shortage. Animals that cannot accumulate sufficient fat reserves before winter may not survive hibernation. Forestry operations conducted without dormouse surveys disturb hibernating animals and destroy nest sites. Dormice disturbed during hibernation burn valuable fat reserves and may die before food becomes available in spring.