- Lifespan
- 3–4 years in the wild; up to 10 years in captivity
- Size & Weight
- 20–25 cm body length, 15–20 cm tail; 250–500 g
- Habitat
- Coniferous and mixed woodlands with abundant seed-bearing trees, particularly spruce, pine, and larch plantations.
- UK Distribution
- Now restricted to scattered populations in Scotland, northern England, Wales, and a few isolated populations in southern England; resident year-round but range severely fragmented.
- Diet
- Seeds from pine cones and other conifers, hazelnuts, acorns, berries, fungi, tree bark, and shoots; caches food for winter.
- Predators
- Pine martens, foxes, stoats, weasels, raptors (especially goshawks and buzzards), and domestic cats.
- Mating Season
- December to February
- Breeding
- Litter size 3–4 kits; gestation period approximately 35–38 days; one litter per year; kits weaned at 8–10 weeks.
- Behaviour
- Highly agile arboreal forager, spending most of its life in trees. Solitary and territorial, with distinctive ear tufts becoming more prominent in winter. Creates large winter food caches (middens) in tree crevices.