Quoted from Living Downstream:

Carson studied the failed attempt to prevent the Japanese beetle from invading Iroquois County, Illinois, a rural farming community located due east of my home county. After intense and repeated pesticide bombardments by air during the mid-1950s, many insect species, sickened by the spraying, became easy prey for insect-eating birds and mammals. These creatures became poisoned in turn and, in ever-widening circles of death, went on to sicken and kill those who fed on their flesh, leaving a landscape devoid of animal life—from pheasants to barnyard cats.

Meanwhile, the targeted beetle species continued its westward advance. The protracted war against this enemy had accomplished nothing, but the residues of dieldrin remaining in the water and soil—like landmines left behind by a retreating army—guaranteed further casualties for decades to come. All for the dream of a beetleless world. The ecological tragedy of Iroquois County, said Carson, is narrated by the mute testimony of its dead ground squirrels: found with their mouths full of dirt, they had gnashed at the ground as they died.

Steingraber, Sandra (2010-03-23). Living Downstream: An Ecologist’s Personal Investigation of Cancer and the Environment (pp. 19-20). Da Capo Press. Kindle Edition.

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