Their range extends to throughout northern Tweedsmuir Park in alpine and forested habitat in the summer and to the mouth of the Entiako River where the migrates in late winter. By the early 1990s the herd was already declining. Research was undertaken to manage the herd as logging activities were proposed in the area near their winter range.
Their territory spans northern Tweedsmuir Park, covering alpine and forested zones during summer and reaching the Entiako River's mouth by late winter. By the early 1990s, the herd had started to decrease in numbers. Research was undertaken to preserve the herd as logging activities were proposed near their winter habitat.