This is the job description <a href="http://skipetriny.cz/musclemeds-carnivor-beef-aminos-300-tablets-0a52.pdf">musclemeds carnivor beef aminos 300 tabl</a>  In order to find out how these PCBs might be impacting songbirds, the researchers non-lethally investigated total PCB loads, congener specific PCB profiles and the songs of black-capped chickadees and song sparrows. Since these songbirds feed their young PCB-contaminated aquatic insects as their main food source, the researchers expected to see at least some PCBs within the songbirds.