Pb and Cd concentrations in the livers in the relation to the development and mortality of Passer domesticus and P. montanus nestlings in urban parks of Warsaw and suburban villages were studied. Pb concentrations in the livers of both species were higher in sick and dead nestlings than in healthy ones. The proportion of sick and dead nestlings was increased in the classes of Pb concentration higher than 2 µg·g⁻¹ of dry weight. The mean deviations of the body weights of healthy and sick nestlings from the model weight were lowest at Pb concentrations in the liver less than 2 µg·g⁻¹ of dry weight. No significant differences were found in Cd concentrations in the livers of healthy, sick and dead nestlings. Proportions of these categories of nestlings in different classes of Cd concentrations were similar.
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