7th Grade Life Science students recently went to the Fairfield Audubon Center not to study birds but the health of wetlands environments. Students learned that while pH and other indicators can identify a healthy wetland, the best indicator of a healthy wetland is a large number of pollution intolerant macroinvertebrates (small organisms without backbones). In places with leeches and midge larva, pollution is high, while places where fly fisherman favorites, stoneflies and caddisflies live indicate low pollution. Students also replicated the role of the forest floor in filtering drinking water.