Both are amphibians, salamanders. In general adult mudpuppies are small than mature hellbenders. However, the prime difference is that the mudpuppy has external gills (feathery red structures sticking out beside the head while the hellbender does not. If there's lots of oxygen in the water in which mudpuppy is living, these might be quite small. In contrast the hellbender breathes through its skin and the folds in its skin increase respiratory surface area. The mudpuppy is called a neotenic form. Neoteny is a life process where the animal reaches adulthood (sexual maturity) while retaining larval characteristics (gills).
Recreational Kayak Paddle
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