The white-tailed eagle (Haliaeetus albicilla) is the largest bird of prey in the Pannonian plain and the only member of the genus Halieaeetus in Europe. According to data from 2009 the Croatian population is estimated at 135-155 couples, and currently the stated number has certainly increased. Based on the monitoring carried out in 2022 in the area of the Lonjsko Polje Nature Park, 59 nests were recorded. During the first visit, in February 2022, the number of active nests was 58, while only one nest was found to be inactive. During the second visit in May 2022, 4 nests were not visited due to inaccessibility, and out of the nests visited, young were seen in 29 of them, and the total number of young seen during monitoring was 34. The average number of young in the nest was 1.21. Due to various threats to the white-tailed eagle, the main objectives of the monitoring are to determine the population size and the success of the nesting. The main measures to avoid pressures on eagles are the conservation of the habitat and the marking of the ring in a zone of 100 meters radius around the nest where it is necessary to ensure peace during the nesting season.