Red River Mudpuppy vs. Hellbender
Both are big aquatic salamanders of rocky streams; their ranges touch in the Ozarks of Arkansas and Missouri (records share 1 one-degree square). A: Bushy red gills behind the head, kept for life in the Red River Mudpuppy; no gills; a huge flat head with tiny eyes in the Hellbender. B: Smooth skin with bold dark spots in the Red River Mudpuppy; loose, wrinkled skin folds along the sides in the Hellbender.
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