Genus Lutra is a classification assigned to a group of aquatic animals commonly known as otters. Otters are carnivorous mammals found in both freshwater and marine environments. There are several species of otters within the Genus Lutra, each with its own unique characteristics and habitat preferences. For example, the Eurasian otter (Lutra lutra) is found in Europe and Asia, while the North American river otter (Lutra canadensis) is found throughout North America. The sea otter (Enhydra lutris) is the only fully marine species within the Genus Lutra. Other synonyms for Genus Lutra include otter genus, river otter genus, and sea otter genus.