Eurasian bittern
There are 185 species of birds in the reserve, of which 120 are resident. Because of such large number of birds, including rarities like night heron and spotted crake, Zasavica is included in the list of IBAs, (important bird areas). Since 1998, 20 artificial nesting platforms have been placed throughout the reserve. Other species include common moorhen, little grebe, Eurasian coot, great reed warbler, little bittern, mallard, common quail, white stork, black stork, Eurasian bittern, white-tailed eagle, western marsh harrier, common kestrel, mute swan, northern lapwing, etc.