They kill with bites to the back of the neck. They occasionally emit a shriek when seizing prey. Nature seldom provides a steady source of food. The weasel's mode of survival involves killing whatever it can, whenever it can. When confronted with an abundance of mice, the voracious weasel follows the only pattern it knows and will kill more than it can eat at one time.
Dens often have a side chamber used as a store room for surplus slain mice.
Weasels use forested, brushy, and open country. On the Arctic Slope and in the plateau areas they primarily live in areas of geographic relief such as slopes, rock slides, and stream banks. Weasels typically do not occur in wet sedge or grass meadows. However, they will move into the lowlands during the peak portion of lemming cycles. Most weasel activity occurs at or near ground level.