Abstract
An experiment was conducted among free‐ranging red‐winged blackbirds (Agelaius phoeniceus) that acquired illness‐induced conditioned taste aversion (CTA) by consuming insect prey tainted with a dose of parathion up to 2.0 mg/kg consumer body weight. Birds quickly acquired CTA and avoided all four insect prey during a lengthy posttest without parathion. This experiment proved that organophosphate insecticide application in the field might decrease the food consumption of wild birds and may also affect the reproductive success of breeding birds. Thus, CTA acquired accidentalty after eating insecticide contaminated insect prey appears to be one of the reasons for the decreasing number of breeding songbirds in North America
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