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An accountancy practice price for amoxicillin or In passerines, song is a critical form of communication that is used to identify and attract mates, and to defend a territory. We know that birdsong is sensitive to DDT and to heavy metals, but no one knows whether or how PCBs may affect birdsong. However, considering that birdsong is dependent upon endocrine hormones, and since endocrine hormone action is mimicked or disrupted by PCBs, it is reasonable to suspect that PCB exposure may cause observable changes in birdsong. There is some evidence to suggest this may be the case: lab experiments have found that PCB exposures decrease the volume of a particular brain region that is correlated with the structure of song in songbirds.