The Effect of Polychlorinated Biphenyls on the Song of Two Passerine Species Source: PLoS ONE Polychlorinated biphenyls (PCBs) are synthetic chemical pollutants with demonstrated detrimental toxic and developmental effects on humans and wildlife. Laboratory studies suggest that PCBs influence behavior due to their effects on endocrine and neurological systems, yet little is known about the please read published on Full Text Reports visit site