Kevin Johnson of the Urbana U.S. Geological Survey office attached a small digital camera to a pair of tethered helium balloons to get aerial photographs of dye injection on the Des Plaines being done to find paths invasive species might take to the Illinois River. (Kevin Johnson, USGS)

U.S. Geological SurveyKevin JohnsonInvasive Species
Kevin Johnson of the Urbana U.S. Geological Survey office attached a small digital camera to a pair of tethered helium balloons to get aerial photographs of dye injection on the Des Plaines being done to find paths invasive species might take to the Illinois River. (Kevin Johnson, USGS)
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