Learn and perform field and laboratory techniques used by scientists studying the Upper Mississippi River. Collect and identify macroinvertebrates, the small "critters" living in the mud and swimming in the water. Identify and learn about aquatic plants, trees, reptiles and amphibians of the floodplain forest. Observe and identify birds and the nests they make. Simulate tracking animals with radio transmitters. Navigate the forest and prairie using Global Positioning System, aerial photographs and land maps.