I recently heard Bill Hopkins, professor of fish and wildlife conservation at Virginia Tech University, give a talk about hellbenders, giant salamanders that can reach a length of more than 2 feet. They live in cold-water trout streams in several eastern states, historically ranging from southern New York, west into Missouri and Arkansas and south to northern Georgia and Alabama. Sadly, hellbenders have disappeared from more than half of the streams where they once thrived, a cause for grave concern. Hopkinsās research demonstrates how these extraordinary salamanders serve as indicators of water quality, thus functioning as sentinels of the environmental health of a stream.