The Alaska moose (Alces alces gigas) or giant moose or Alaskan moose is a subspecies of moose that ranges from eastern Kamchatka, Alaska to western Yukon. The Alaska moose is the largest North American subspecies of moose. Alaska moose inhabit boreal forests and mixed deciduous forests throughout most of Alaska and most of Western Yukon. Like all moose species, the Alaska moose is usually solitary but sometimes will form small herds. Typically, they only come into contact with other moose for mating or competition for mates. During mating season, in autumn and winter, male Alaska moose become very aggressive and prone to attacking when startled.