Subfamily Lutrinae refers to a group of semiaquatic mammals commonly known as otters. These adorable creatures can be found globally in rivers, lakes, and oceans. Although the term Subfamily Lutrinae is widely used, there are several synonyms used to describe otters. Some of the popular synonyms include the names weasels, mustelids, and ferrets. The term mustelids is used to describe mammals belonging to the family Mustelidae, which includes otters, badgers, and weasels. On the other hand, the term ferrets describes a group of mammals closely related to otters, including weasels and stoats. In summary, despite being known as Subfamily Lutrinae, otters are referred to by various synonyms.