- mud puppy, Necturus maculosus - aquatic North American salamander with red feathery external gills
--1 is a kind of salamander
--1 is a member of Necturus, genus Necturus - hellbender, mud puppy, Cryptobranchus alleganiensis - large salamander of North American rivers and streams
--2 is a kind of salamander
--2 is a member of Cryptobranchus, genus Cryptobranchus - axolotl, mud puppy, Ambystoma mexicanum - larval salamander of mountain lakes of Mexico that usually lives without metamorphosing
--3 is a kind of ambystomid, ambystomid salamander