MUD PUPPY

any of five species of salamanders in a genus (Necturus) belonging to the family Proteidae (or Necturidae), in the order Caudata. Their popular name derives from the mistaken belief that they are able to bark. They are found in lakes, rivers, and swamps of eastern North America. Those of the southern United States are commonly called water dogs. Adults range from approximately 20 to 33 cm (8 to 13 inches). The body is gray or brown and usually has a scattering of blurry blue-black spots. The tail fins have an orange tint. The external gills, retained throughout life, are bright red. The short, weak legs have four toes. Mud puppies usually hide during the day under stones or buried in mud. They eat small animals such as crayfish or mollusks and the eggs of other aquatic animals. Fertilization is internal, and the female lays eggs.