Criterion (x) : The park is unique in protecting almost the entire catchment of a large tropical river and has one of the widest ranges of habitats and greatest number of species documented of any comparable area in tropical northern Australia. Kakadu’s large size, diversity of habitats and limited impact from European settlement has resulted in the protection and conservation of many significant habitats and species.
The property protects an extraordinary number of plant and animal species including over one third of Australia’s bird species, one quarter of Australia’s land mammals and an exceptionally high number of reptile, frog and fish species. Huge concentrations of waterbirds make seasonal use of the park’s extensive coastal floodplains.