Otterly Factual ClassificationCommon name: OtterFamily: MustelidaeSubfamily: LutrinaeClass: Carniverous Mammal There are thirteen species of otters, all of which are aquatic or semi-aquatic in nature. They are related to other elongated and short legged creatures such as weasels, badgers, mink, and wolverines. Habitat Otters are found in every continent except Antartica. Being aquatic creatures, you will find them in wet habits such as rivers and coastlines. Most otters live in underground dens for their homes, but the viciously adorable sea otter prefers to live in the ocean.