September 2001
Question: What pesticide has caused the most documented bird kills in the past 5 years in the United States?

A Great Blue Heron ingests pesticide runoff in a residential pond while preening and feeding.  Rain washes the pesticides from residential lawns down into the storm drainage system beneath the street.  These pipes empty into the nearest stream or lake, contaminating the water.
A. Carbofuran (Furadan)
B. Diazinon
C. Chlorpyrifos (Dursban)