Definition of long-tailed weasel
: a common weasel (Mustela frenata) found from southern Canada to northern South America often near water that is an aggressive carnivore feeding chiefly on rodents and other small mammals, is brown above and white to yellowish below in summer and in its northern range usually white in winter, and ranges in length from 15 to 23 inches (38 to 58.4 centimeters) long including a black-tipped tail that is usually 3 ½ to 6 ½ (9 to 16.5 centimeters) inches long
Note: The long-tailed weasel is also known as the bridled weasel due to white and yellowish facial markings often present chiefly in southern populations.— compare short-tailed weasel
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