Overview

The reindeer (Rangifer tarandus) is a northern deer species found across Arctic and subarctic regions of Eurasia and North America. In North America it is commonly called the caribou. Taxonomists place it among the even-toed ungulates and within the broader deer family. Populations are divided into multiple subspecies or regional herds whose boundaries and names vary among researchers.

Physical characteristics and adaptations

Reindeer are adapted to cold, open landscapes. Both males and females grow antlers each year, a rare trait among deer, and coats thicken and change color with the seasons. Their large, round hooves spread to support weight on snow and soft tundra and act as effective snowshoes. Dense underfur and hollow guard hairs trap air for insulation, while special nasal structures warm inhaled air. Research also indicates they can detect ultraviolet light, which helps them see contrasts against snow and find lichens and predators.

Range, migration and behavior

Different populations occupy tundra, taiga and mountainous areas from Scandinavia and Siberia to Alaska and northern Canada. Some herds undertake long seasonal migrations, among the longest of any terrestrial mammal, travelling between winter feeding grounds and summer calving areas. Diets are mainly lichens in winter and a broader mix of grasses, herbs and shrubs in summer. Social structure varies with season—dense migratory herds contrast with smaller family groups at other times.

Human relationships and uses

Reindeer have been closely associated with northern indigenous peoples for millennia. Certain groups practice reindeer husbandry, keeping animals for meat, milk, hides and transport. This domestication is unusual among deer species: many sources note that reindeer are the only deer to have been widely domesticated. Modern herding continues in parts of Scandinavia and Russia, and in some regions reindeer remain central to cultural identity and subsistence.

Conservation, threats and notable facts

Conservation status differs among herds: some are stable while others are declining because of habitat loss, industrial development, climate change and overhunting. Management efforts often seek to balance local livelihoods and ecosystem needs. Notable facts include female antlers retained into winter in many populations, the species' association with northern folklore and holiday imagery, and long-distance migrations documented for several caribou herds. For further taxonomic and regional information see introductory resources on deer classification, human-reindeer relationships at regional guides, and domestication studies at relevant research summaries.

  • Key adaptations: hollow guard hairs, wide hooves, seasonal coat changes.
  • Human uses: meat, milk, hides, transport and cultural significance.
  • Distinctive trait: antlers on both sexes in most populations.