The family "Proteidae" consists of aquatic salamanders known as mudpuppies and waterdogs. These creatures are primarily found in North America and parts of Europe. They are characterized by their external gills, which resemble feathery structures, allowing them to breathe underwater. Proteidae species are typically found in freshwater habitats like rivers and lakes. Proteidae members are unique among salamanders because they exhibit neoteny, meaning they retain juvenile features into adulthood. This includes their gills and aquatic lifestyle. They play an important role in their ecosystems, helping to control populations of small aquatic organisms and serving as prey for larger animals.