The Stoat (Mustela erminea) is a small mammal of the family Mustelidae, which also includes other weasels, mink, otters, ferrets, badgers, polecats, wolverines, martens, tayra, fisher and skunks. The Stoat is also known as the Short-tailed weasel and the Ermine. Stoats are found throughout mainland Britain in a variety of habitats.
Stoats are absent from Mediterranean countries and Southern Europe. They are considered to be the most widespread mustelid. The Stoat pre-breeding season population is estimated to be 462,000 adults.
The Stoat has an average head, and body length of between 16 and 31 centimetres and stoats in Britain can weigh from 90 to 445 grams. Male stoats usually measure 29 centimetres with a tail length of 11 centimetres and females around 26 centimetres with a 9-centimetre tail length. Male stoats are larger than females.