Bull moose (Alces alces gigas) in his fall grandeur. south central Alaska. Moose are the largest member of the deer family. The Alaska-Yukon race is the largest of all of these creatures. Adult moose can range in size from 800 pounds (small adult female) to1,600 pounds (large adult male), and they can be up to 6 feet tall. Moose can range in color from golden brown to almost black, depending on the season and the age of the animal. Moose are often easily recognized by their antlers, carried only by the males. These bony protrusions form within the first year, and are produced every summer after that. The largest sized antlers are usually produced when bulls are 10 - 12 years old, but bulls can reach maximum size as young as 6 years of age. In the wild, moose rarely live more than 16 years.