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Mudpuppy, or water dog (Necturus maculosus), salamander growing up to 2 ft (0.6 m) that lives in many North American rivers and streams. It retains its gills even when adult. Mud puppies get their name because they are reputed to emit barking sounds; however, they possess no voice organs of any kind

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Mudpuppy to Nebula