Concentrations of cadmium, lead, copper and zinc were measured in the liver, kidneys, pectoral muscle and feathers of the Mallard Anas platyrhynchos (N = 16) in Kanibarazan Wetland, northwestern Iran. The concentration of metals was estimated using Varian 220 graphite furnace atomic absorption spectrometer. The highest mean concentrations of Cd, Pb, Cu and Zn were observed in the liver at 1.05, 2.37, 10.69 and 59.63 µg g-1 dw, respectively. The lowest mean concentration of Cd, Pb and Zn were found in muscle tissue at 0.46, 0.91 and 20.6 µg g-1 dw, respectively, while the lowest mean concentration of Cu was measured in feathers at 6.44 µg g-1 dw. The concentration of metals follows the sequence: Zn>Cu>Pb>Cd. In this study, heavy metal concentrations in the studied tissues of the Mallard were lower than the background levels
