Several animal species inhabit Level Mountain, notably brown bears, wolves, long-tailed jaegers, caribou, mountain goats, ptarmigans, moose, long-tailed ducks and Stone sheep. Wolves occupy valleys and use the alpine areas for hunting and denning. Brown bears are common in the alpine and are potential predators of newborn caribou calves. The caribou at Level Mountain form a herd that is part of a larger population ranging west of the Dease River and north of the Stikine River into Yukon. More than 400 caribou were identified at Level Mountain in 1978, although the Ministry of Environment and Parks considered the herd to be declining due to poor recruitment. By 1980, the caribou population was estimated to have been roughly 350.