Adults are almost entirely brown. The mink is one of few mammals in which males are larger than females. Males are 27 1/4 inches long and 3 pounds while the largest female may be only 21 1/4 inches long and 2 pounds. Musk glands in the anal region secrete a strong odor considered by many to be more obnoxious than that of either weasel or skunk. This odor is given off particularly during the breeding season but also at any period of intense excitement.