This included whitetail, elk, moose, and caribou. They were originally hunter-gatherers dependent on caribou, moose and the fur trade. Megafauna includes large mammals such as black bears, caribou, and wolves. Their subsistence activities were historically centred on hunting and trapping caribou, deer and small game. The Low Arctic population of Peary caribou was designated as threatened. The Dorset culture population lived primarily from hunting of whales and caribou. Quebec-Labrador bull caribou antlers can be significantly larger and wider than other woodland caribou. The flooding of the reservoir destroyed large areas of habitat for the threatened Woodland Caribou. Subsistence is highly dependent upon the hunting of caribou and whale. This is because the proportion of caribou killed per wolf decreases as caribou density increases. Hunting and fishing continue in Adak, especially caribou. They are generally found only on males, with the exception of the reindeer/caribou. Igloos used as winter shelters had beds made of loose snow, skins, and caribou furs. Inuit nations include the Caribou, Central, and Copper nations. "Otters", "Caribou," and "Chipmunks" were to follow.