Perfluorooctane sulfonate concentrations were elevated in great blue heron eggs at the Pigs Eye heron rookery near a manufacturing plant. Concentrations in eggs were less both upstream and downstream. Concentrations at the Pig’s Eye rookery are some of the highest ever recorded in bird eggs.
Custer, T.W., K. Kannan, L. Tao, S.H. Tun, and A. Trowbridge. 2010. Perfluorinated compounds and polybrominated diphenyl ethers in great blue heron eggs from three colonies on the Mississippi River, Minnesota. Waterbirds 33:86-95.