Ermine, Stoat, Short-tailed weasel (Mustela erminea), in winter coat at a dead tree trunk, Germany, Stock Photo, Picture And Rights Managed Image. Pic. BWI-BS350364 | agefotostock
Some stoats (Mustela erminea) change their fur coats from chestnut-coloured to white during the winter to allow them to camouflage. This white coat is called ermine. : r/Awwducational
Least weasel Mustela nivalis in a winter coat. Ermine (stoat) vs little weasel - how to distinguish - YouTube