EN
The white Stork (Ciconia ciconia) bred in the communes Poddębice, Uniejów,
Pęczniew and Zadzim (Central Poland) in 1984 at a density of 12.8 pairs/100 km2. The mean number of nestlings per nest occupied by a pair was 1.40 and the mean number of nestlings per nest with nestlings was 2.49. 85% of nests were situated on trees and 99%
were up to 100 m from buildings. Corrected formulas for calculating values of JZG and
JZa were given.