The stoat, also called this, is a type of weasel, & in wintertime is known for its white coat
This kind of coat is very 
similar to the coat of the long-tailed weasel (Mustela frenata),... [DOC] [TLE] Ermine And Weasels 2 Coats Winter Animal - Pinterest [PAR] The ermine's coat changes to a thick warm all white coat in the winter.