Levels of PCBs in wild bird eggs: Considering toxicity through enzyme induction potential and molecular structure

► The metabolic potential of the PCBs showed agreement with biodegradability. ► Phenobarbital-type inducer and metabolic group I PCBs were prevalent. ► 88% of PCB congeners measured was found in more than 80% of samples. ► PCB levels, including dioxin-like PCBs, were highest in piscivore species. ► The high prevalence of CB-138, -153 and -180 make them ideal for monitoring PCBs.