The reindeer, also known as the caribou (Rangifer tarandus), is one of the most iconic cold-climate deer. It is strongly associated with the Arctic and subarctic—taiga forests, tundra plains, and snowy landscapes—and it has become a staple of winter folklore. Beyond the stories, reindeer are real, highly adapted ruminants that often travel huge distances and typically produce one calf per female each year. Below is a clear guide to their key traits, where they live, what they eat, and why some populations are declining.
Reindeer/Caribou Characteristics
Antlers in both sexes: reindeer are unusual among deer because both males and females grow antlers. Female antlers are typically smaller, and antler size and branching become more complex with age.
Body size: adults commonly measure about 1.5–2.3 m in body length, with a shoulder height around 1.2 m. Males can be up to twice as large as females in some populations.
Weight: highly variable, ranging roughly from 55 to 300 kg, depending on sex, subspecies, and habitat quality.
Coat color: can range from dark brown to nearly white, influenced by geography, sex, and season.
Cold-weather insulation: they carry thick neck fur for warmth, and the antler base develops a fine, dense “velvet” while the antlers are growing.
Speed: they can run fast—up to about 80 km/h in short bursts.
Types of Reindeer
Reindeer vary widely by region, and many classifications recognize multiple subspecies. A practical way to understand them is to group them into two broad ecological types:
1) Tundra reindeer
Strongly migratory, often moving long distances between seasonal ranges.
Typically shift between tundra and forest edges depending on the time of year.
In general, herds that live farther south often migrate farther to avoid harsh winter conditions.
2) Forest reindeer
More closely tied to wooded habitats and often live farther south than tundra forms.
Usually migrate shorter distances (or make smaller seasonal shifts) rather than long, sweeping migrations.
Often less abundant than tundra reindeer in many regions.
Where Reindeer/Caribou Live
Reindeer inhabit the Arctic and subarctic across both the Old World and the New World, occupying taiga forests and tundra landscapes. They can also use nearby coastal zones, Arctic islands, and mountain plains.
Winter strategy: many populations spend winter in more sheltered, wooded areas, where snow can be shallower than in open tundra.
Geographic range: they occur across northern latitudes in places such as Alaska and Canada, Scandinavia, and large parts of Russia, among other northern regions.
What Reindeer/Caribou Eat
Reindeer are grazers and browsers and, like other deer, they are ruminants with a multi-chambered stomach that helps them break down tough plant material. Their sense of smell is exceptionally strong and helps them locate food buried beneath snow.
Main foods
Lichens (a partnership of fungi and algae) and mosses, especially important in winter.
Grasses and low tundra plants during the warmer seasons.
Fungi and woody browse such as willow twigs and branches when available.
To reach food in winter, they often scrape and dig through snow with their hooves.
Behavior
Rutting season competition: males compete intensely for mates, sometimes fighting and injuring each other. They also produce loud, distinctive vocalizations.
Costly rut for males: during peak rut, males may eat less and lose significant body reserves, which can leave them more vulnerable to predators.
Herding: in warm months, they often form large groups that may include hundreds of individuals. In winter, groups can become smaller and more spread out, though they rarely become truly solitary.
Communication: they use a mix of vocalizations and scent cues.
Reproduction
Breeding season: typically in autumn, when males enter rut.
Harem structure: a common pattern is one male associating with about 5–10 females.
Gestation: about 230 days.
Calves: usually one calf per female per year.
Early life: calves rely heavily on milk at first, and in their earliest weeks they can be vulnerable to predators such as wolves and bears in parts of the range.
Threats and Conservation
Some reindeer/caribou populations are declining. While conservation status can vary by region and population, major pressures are broadly similar across the range.
Key threats
Habitat disruption and land-use change: industrial development, road building, and expansion of recreational areas can fragment migration routes and reduce access to seasonal feeding grounds.
Human disturbance: increased activity in sensitive areas can push herds away from preferred habitats.
Illegal or unsustainable hunting: in some places, hunting pressures exceed what populations can replace, especially where enforcement is weak or conditions have changed rapidly.
Because many herds depend on wide, connected landscapes, protecting migration corridors and limiting fragmentation can be as important as protecting any single site.
Reindeer vs. Moose: What’s the Difference?
Face shape: moose have a larger, more pronounced muzzle with a drooping upper lip, while reindeer have a more streamlined face.
Size: moose are generally much larger than reindeer.
Social style: reindeer often form large groups; moose are more solitary.
Diet: reindeer rely heavily on ground-level plants and lichens; moose browse more on shrubs and tree leaves.
Antlers: both sexes of reindeer can have antlers; in moose, typically only males have antlers. Reindeer antlers are often more branched, while moose antlers tend to be broader and more “palm-shaped.”
Reindeer vs. Deer: What’s the Difference?
Climate: reindeer are more cold-adapted; many “deer” species prefer temperate habitats.
Diet: reindeer often eat lichens and ground vegetation; many deer browse more on leaves and twigs.
Fur: reindeer have a denser coat built for extreme winters.
Antlers: both sexes can have antlers in reindeer; in many deer species, antlers are mainly in males.
Size: reindeer are often larger than many common temperate deer (though sizes vary widely across deer species).
Fun Facts About Reindeer/Caribou
They are the only deer in which both males and females commonly grow antlers.
They can travel immense distances—some migrations can total thousands of kilometers in a year.
Their hairs are partly hollow and packed tightly, helping trap heat and insulate against cold.
They can swim and cross waterways during migration.
Lifespan: often around 15 years in the wild (varies by region and conditions).
Their hooves are concave and can spread to distribute weight on snow and soft ground, improving traction and reducing sinking.
You may hear a distinctive clicking sound when they walk, produced by tendons around the feet.
Calves can be surprisingly capable soon after birth—many can stand and walk within about an hour.
Some populations have been domesticated and are used in herding and other traditional livelihoods.
They can perceive ultraviolet light, which may help them detect contrast in snowy environments.
