Necturus
Necturus is a genus of aquatic salamanders commonly known as waterdogs or mudpuppies. These amphibians have external gills and four legs, with a long, slender body and a flattened tail. They are typically found in freshwater habitats such as rivers, streams, and lakes, where they feed on small aquatic invertebrates. Necturus species are known for their vibrant coloration, which can range from red to brown to gray, and their ability to regenerate lost body parts.