> Pollen and propolis are collected by bees and many of these samples contained detectable concentrations of PCBs. Bees will collect drying paint, road tar, window putty and similar materials in areas where natural propolis is scarce.
-- Morse, et al. Polychlorinated Biphenyls in Honey Bees. Bull. Environ. Contain.Toxicol. (1987) 38:271-276
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