Hazel Dormouse Hibernation Check — Cotswolds England
The hazel dormouse (Muscardinus avellanarius) — Britain's only native dormouse, a hibernating arboreal rodent that spends 7 months of the year in a deep cold-torpor hibernation, and one of the UK's most endangered mammals (85% population decline since 1900) — is monitored by 2,000 volunteers across the Cotswolds and Welsh borders in a National Dormouse Monitoring Programme whose nest box checks from April through November produce brief handling encounters with one of Britain's most charming small mammals. At sites like Haresfield Beacon and Rodborough Common in Gloucestershire, a dormouse check produces sleeping or active dormice in the nest boxes — the animal's tightly-rolled sleeping posture, its golden-rufous coat, and the complete stillness of a deeply torpid individual creating one of Britain's most intimate wildlife handling experiences, available only to trained licence-holders but observed by nature reserve visitors at organised check events.
About this spectacle
Standing quietly at the woodland edge of Haresfield Beacon or Rodborough Common on a cool April morning, you watch a trained volunteer lift a wooden nest box lid to reveal something extraordinary: a hazel dormouse curled into a perfect ball, its golden-rufous fur glowing against a bundle of grass and leaves. In deep torpor the animal is utterly still, its tiny body cool to the touch, its breathing imperceptible — a pocket-sized marvel that has slept this way for months. When checked later in season, an active dormouse may grip the handler's finger with miniature claws, its large dark eyes scanning cautiously. These organised check events allow visitors to observe at close range — not handling themselves but close enough to see every whisker, every amber hair — while volunteers record weights and breeding condition for the National Dormouse Monitoring Programme. The Cotswold sites sit within ancient scrub and hedgerow habitat that sustains one of Britain's most precarious mammal populations, making each sighting feel both tender and urgent.
When to go
Apr — Nov
Getting there
Nearest airport: BRS. Nearest city: Gloucester.
Booking options
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