Hazel Dormouse

Fascinating facts about the Hazel Dormouse

• The hazel dormouse is a small, nocturnal rodent found across northern Europe and into Asia Minor. It is the sole surviving member of the genus Muscardinus, making it a unique evolutionary line with no close living relatives. Its presence is especially notable in the British Isles, where it is the only native dormouse species. This limited taxonomic diversity highlights its conservation importance.
• Surveys show the hazel dormouse population has slumped by 72% between 1993 and 2014, signalling a serious decline. The drop is linked to ongoing woodland habitat loss and the pressures of climate change, both identified as key threats to its future. As its numbers fall, the species becomes increasingly vulnerable across its European range. Conservation efforts now focus on protecting its forest and hedgerow homes.
• A hazel dormouse rarely roams far, typically staying within 70 m of its nest, which keeps it close to familiar feeding sites. It lives almost entirely in the trees, spending nights foraging among branches and avoiding the ground whenever possible. When forced to move, it prefers long detours in the canopy rather than descending, reducing exposure to predators. This strong site fidelity shapes its daily movements and habitat use.
• Before hibernating, a hazel dormouse can more than double its body mass, rising from 17-20 g to 30-40 g. The extra fat stores provide essential energy for the long winter sleep.
• Fossils place the Muscardinus lineage back to the Middle Miocene, about 13.8 to 11.6 million years ago. These ancient remains, found in present-day Spain, mark the deep evolutionary roots of the hazel dormouse.

Sources

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• Wikipedia

At a glance

About the Hazel Dormouse

In the dappled depths of woodland, the hazel dormouse weaves a secret existence, its large, round eyes blinking slowly as it navigates the intricate network of branches with a gentle, unhurried ease. With a soft, furry coat the color of autumn leaves, this tiny, arboreal creature moves through the world with a quiet confidence, its delicate paws barely making a sound as it searches for the ripest hazelnuts and sweetest berries. As it curls up in a snug ball, its bushy tail wrapped tightly around its body, the hazel dormouse embodies a sense of tranquil, forest-dwelling contentment.

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