Reindeer

Female antlers

Reindeer are the only deer species in which females regularly grow antlers — in all other deer species, antlers are exclusive to males. Males shed their antlers in autumn after the rut; females retain theirs through winter. This means the famous Christmas reindeer depicted with antlers in December are almost certainly females (or castrated males), since intact males are antler-free by then.

Arctic adaptations

Reindeer are supremely adapted to Arctic conditions. Their hollow, air-trapping fur provides exceptional insulation. Their broad, concave hooves work like snowshoes and paddles for swimming. Their noses have a complex warm-and-moisten system that heats Arctic air before it reaches the lungs. Their eyes can shift perception into the ultraviolet range, which helps detect predators, urine trails, and lichen against snow.

Domestication and the Sámi

Reindeer are the only semi-domesticated deer. The Sámi people of Scandinavia have herded reindeer for over 3,000 years, following their seasonal migrations across vast territories. Reindeer provide everything: meat, milk, hide for clothing and tents, bone tools, and draught animals. Reindeer herding remains central to Sámi culture and identity.

Lichen and the tundra

In winter, reindeer dig through snow with their hooves to reach lichen — among the few organisms that provide food when the tundra is frozen. They can smell lichen buried under 60 cm of snow. Their dependence on lichen makes them sensitive to habitat degradation and climate change, which alters snow conditions and lichen availability.