We have begun to observe and to speculate about more subtle impacts that human activities may be having at a global level. These changes are certain to have an effect on the ecosystem. It is possible that amphibians are responding adversely to these changes. Like the canaries that were used as gas detectors in the mines, amphibians may deserve attention because they are especially sensitive to pollutants and other stresses in both terrestrial and aquatic environments. They may be telling us something is not right in the environment.
Humans breathe the same air and drink the same water.
We should question whether the problems the amphibians are having don't raise concerns for human health. Teachers should verify their own results prior to the use of these lesson plans in a classroom setting. Safety glasses or goggles should be worn at all times. Other protective clothing should be worn as instructed by the teacher. All materials should be properly disposed of as instructed by the teacher.