Assertion: caribou's population | /r/CapableOf | cover 1,000,000 km2
Facets:
Source sentences:
text: Some populations of North American caribou, for example many herds in the barren-ground caribou subspecies and some woodland caribou in Ungava and Labrador, migrate the farthest of any terrestrial mammal, travelling up to 5,000 km (3,000 mi) a year, and covering 1,000,000 km2 (400,000 sq mi).