Genus Necturus is a group of aquatic salamanders that are referred to by a number of different synonyms. These include the red salamander, water dog, and mudpuppy. The red salamander gets its name from its distinctive reddish-orange coloration on the sides of its body, while the water dog is a reference to their aquatic lifestyle and their resemblance to small dogs. The mudpuppy is another popular synonym for the Genus Necturus, and refers to their tendency to burrow into the mud at the bottom of rivers and streams. Whatever you call them, these fascinating creatures are an important part of many freshwater ecosystems.