The term CERTAIN FUR is used to refer to four different types of fur-bearing animals: otter, STOAT, ASTOR, and SABLE. Otters are semi-aquatic mammals found in rivers, lakes, and oceans around the world. Stoats are small mammals native to Eurasia and North America, and are related to weasels. Astors are a type of marten found in North America and parts of Europe. Sables are a species of marten found in northern Asia and parts of Europe. ERMINE is another type of fur-bearing animal, which is a species of STOAT found in northern Europe and Asia.