Caribou Barren-Ground Migration — Nunavut Canada

Standing on the open barrens west of Hudson Bay, the arrival of the Beverly or Qamanirjuaq caribou herd is an assault on all senses. Tens of thousands of animals pour across the tundra in a living river — the drumming of hooves building from a distant rumble to a thunder that resonates through the ground underfoot. Most remarkably, the rhythmic clicking of leg tendons — an anatomical quirk unique to caribou — carries clearly 100 metres away, a natural sonar that keeps the herd cohesive in fog and Arctic darkness. In June, cows cluster on the coastal tundra to calve, the landscape dotted with rust-brown newborns on wobbly legs. By September the bulls, their pale antlers spanning impressively, surge through the rut, herding females and clashing rivals. The sky is enormous and uninterrupted; lichen-covered rock stretches to every horizon. Wolves, wolverines, and golden eagles shadow the herd, adding predator drama. This is one of the last great wildebeest-scale migrations on Earth — experienced by very few people.