The Patagonian weasel has a head and body length of 300–350 mm (12–14 inches), with a tail that is 60–90 mm (2.4–3.5 inches). Its fur is whitish with black and dark brown tones mixed in. It has small ears, short legs and a bushy tail. The animal has not been thoroughly studied in the wild, and knowledge of its behavioral patterns is unsure. It reportedly has been kept as a working pet by local ranchers to destroy rodents.
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