Moose are herbivores that need to eat up to 20 kg of vegetation a day to fuel their nearly 10,000 calorie diets.
In North America, the Canada moose (Alces alces andersoni) subspecies is exceeded in size only by the Alaska Yukon subspecies. Males are distinguished by carrying the largest antlers of any mammal, which can weigh as much as 35kg in North American moose. Antlers are grown in the spring and shed in the winter each year.
Pelage is generally dark, black to brown, with the lower legs being lighter. Their underfur and long guard hairs provide excellent insulation from the cold. The males range from 360 to 600 kg with lengths from 2.4 to 3.1 m. Females range from 270 to 400 kg with lengths of 2.3 to 3.0 m.
Moose browse birch, aspen, and willow twigs and leaves; and in winter the needles of balsam fir. They seek new regeneration in logged or burned habitats. Moose frequent lakes to eat aquatic vegetation, at times submerging completely.