Salamanders as Canaries
Season 1100 Episode 1101 | 26m 45s
Coal miners once carried caged canaries to detect detect dangerous gases deep underground. The small caged birds--environmental indicators--served as an early warning of problems. North Carolina is fortunate to have its own state-wide environmental indicator, salamanders. No place on the planet has a greater variety of these beautiful amphibians than the Tar Heel State.
Aired: 07/16/14Video has closed captioning.