Cryptobranchus alleganiensis, commonly known as the Hellbender, is a large aquatic salamander native to the eastern United States. It inhabits fast-flowing, clean rivers and streams and is known for its flattened body, loose skin folds, and nocturnal habits. This species plays a crucial role in aquatic ecosystems by helping control insect populations.

Cryptobranchus alleganiensis, commonly known as the Eastern Hellbender, is native to the eastern United States. Its geographical distribution includes the Appalachian and Ozark regions, spanning parts of states such as New York, Pennsylvania, Ohio, Indiana, Illinois, West Virginia, Virginia, North Carolina, Kentucky, Tennessee, Georgia, Alabama, Arkansas, and Missouri.

The Eastern Hellbender inhabits clear, fast-flowing streams and rivers with rocky substrates. These habitats are typically found in regions with temperate climates, characterized by cold, oxygen-rich water. The presence of large, flat rocks is crucial as they provide shelter and breeding sites.

Hellbenders occupy an ecological niche as aquatic predators, feeding primarily on crayfish, although they may also consume small fish and insects. They play a vital role in maintaining the ecosystem balance by controlling crayfish populations. The species is well-adapted to its environment with a flattened body that aids in slipping under rocks and a permeable skin that facilitates respiration in oxygen-rich water.