Paul Hobson / Weasel (Mustela nivalis) looking out of hole on woodland floor with snowdrops, Sheffield, England, UK.

Paul Hobson / Weasel (Mustela nivalis) looking out of hole on woodland floor with snowdrops, Sheffield, England, UK.

Paul Hobson / Weasel (Mustela nivalis) head sticking out of a snow hole, Sheffield, England, UK.

Jussi Murtosaari / Least weasel (Mustela nivalis) climbing over rocks, Finland, July

Konrad Wothe / Least Weasel (Mustela nivalis), Bavaria, Germany

Juan Manuel Borrero / Illustration of Weasel (Mustela nivalis). Pencil and watercolor painting.

Danny Green / Weasel (Mustela nivalis) amongst leaves. Leicestershire, UK, October.

Danny Green / Weasel (Mustela nivalis) amongst leaves. Leicestershire, UK, October.

Danny Green / Weasel (Mustela nivalis) amongst leaves. Leicestershire, UK, October.

Danny Green / Weasel (Mustela nivalis) amongst leaves. Leicestershire, UK, October.

Ernie Janes / Weasel (Mustela nivalis) hunting in snow, Norfolk, UK, December

Konrad Wothe / Least Weasel (Mustela nivalis) in summer coat, Germany