From Newfoundland and Nova Scotia west to Alaska and south into sections of the rocky mountain range and California.
Females are slightly smaller and lighter.
The fur is long and shiny. The general body shape is long and slender. The marten is an opportunistic feeder that eats primarily small mammals including squirrels and rodents. Occasionally birds, fruit, nuts, insects, and carrion will be eaten as well. The main killing technique consists of a quick, powerful bite to the back of the neck.