Mountain Caribou
Subspecies of Caribou · Rangifer tarandus
Southern mountain populations in British Columbia (Selkirk, Purcell, Monashee, Cariboo, and Columbia mountains), extreme northern Idaho (Selkirk Mountains), and northwest Montana. Northern mountain populations in the Mackenzie Mountains (NWT/Yukon), Alaska Range, and Wrangell-St. Elias Range.
Overview
Mountain caribou (Rangifer tarandus caribou, in its mountain ecotype) represent the most ecologically specialized and conservation-imperiled caribou population in North America. The southern mountain population in British Columbia's Interior Wet Belt mountains has declined precipitously — from approximately 2,500 animals in the 1990s to approximately 1,500 in the 2020s, with some subpopulations reduced to single-digit counts. The Selkirk Mountains subpopulation that extends into northern Idaho and northwest Montana has at various times dropped to fewer than 20 animals, making it one of the most endangered large mammal populations in North American conservation history. The ecological requirements of southern mountain caribou explain both their specialization and their vulnerability. These animals depend critically on old-growth subalpine forest — specifically the ancient Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa) stands that develop hanging arboreal lichens (Bryoria fuscescens, Alectoria sarmentosa, Usnea spp.) over centuries of growth. These lichens serve as the primary winter food source when deep snowpack buries terrestrial vegetation — mountain caribou have evolved to access arboreal lichens by traveling on top of the consolidated late-winter snowpack, reaching lichen hanging on branches at 8–15 feet height that no other ungulate can access. This ecological niche, while brilliant in its specialization, makes mountain caribou absolutely dependent on old-growth forest ecosystems that take 150–250 years to develop and have been substantially reduced by 20th-century logging. The decline of mountain caribou is causally linked to the "predator pit" phenomenon driven by habitat alteration. Logging and other disturbances create early successional habitat that supports high densities of deer and moose, which in turn support elevated wolf and cougar populations. These predators then spill over and kill caribou at rates their populations cannot sustain. Conservation efforts in British Columbia have included experimental wolf culling, maternal penning programs (capturing pregnant cows, raising calves in protected enclosures until they're past peak predation vulnerability, then releasing them), and habitat protection — all controversial, all expensive, all with uncertain long-term prospects. Northern mountain caribou — the populations in the Mackenzie Mountains, Alaska Range, and Wrangell-St. Elias region — occupy different terrain and face less severe threats. These animals follow classic mountain caribou seasonal patterns: summer on high alpine tundra and talus above treeline, winter migration down to lower-elevation boreal forest and wind-swept ridge environments where they access both terrestrial and arboreal lichens. Northern mountain caribou produce the largest antlers of any mountain caribou population, with mature bulls scoring in the 370–420 B&C range on exceptional individuals.
Identifying Features
Larger than barren-ground caribou; darker coloration (often deep chocolate brown to nearly black on the face and legs); antlers often broader and more palmated than barren-ground but less flamboyant in brow shovel development; inhabits steep mountain terrain and old-growth forests rather than open tundra. White neck mane on bulls during rut.
Hunting This Subspecies
Mountain caribou hunting for the sport hunter today means northern mountain populations — the Yukon's Mackenzie Mountains, Alaska's Wrangell-St. Elias and Alaska Range populations, and the Northwest Territories' Mackenzie Mountain region. Southern mountain caribou hunting has been entirely closed and is unlikely to reopen in the foreseeable future given the subspecies' status. Yukon mountain caribou hunting is organized through the territory's big game outfitter system — non-residents hunting certain species in Yukon, including mountain caribou, are required to use a licensed Yukon guide outfitter. This creates a somewhat controlled, high-quality hunting experience but also means significant cost: a quality Yukon mountain caribou hunt with a reputable outfitter runs $12,000–$22,000 for a 10–14 day hunt, often combined with sheep or moose. The remote Mackenzie Mountain hunts involve helicopter or horse access into mountain wilderness that is genuinely spectacular and genuinely wild. Alaska's Wrangell-St. Elias region holds mountain caribou huntable by non-residents with a guide in most units. The Mentasta, Nelchina, and Wrangell-St. Elias herds provide access to mountain caribou habitat ranging from the St. Elias Range's high alpine tundra to the boreal forest valleys of the Copper River basin. Hunt logistics typically involve floatplane access to base camps followed by foot-hunting in alpine terrain. Mountain caribou hunting tactics emphasize high-elevation glassing of alpine basins and ridgelines. Unlike barren-ground caribou where you might encounter hundreds of animals in a single migration, mountain caribou travel in smaller groups (typically 5–50 animals) and cover less dramatic distances per day. Finding individual bands of bulls requires systematic glassing of south-facing slopes (where lichen grows on exposed rock outcrops) and the open subalpine terrain above treeline where caribou feed and rest during September.