The health of wetland ecosystems can be determined by the abundance of waterbird species. Clark's grebe ("Aechmophorus clarkii") is a North American waterbird species in the grebe family. Under favorable environmental conditions, the total number of nesting colonial waterbird nests have exceeded 10,000. But self-funded waterbird census is undertaken each year in selected habitats. Over 100 bird species, including 53 waterbird species, have been recorded within the vicinity. These breeding dances are known to be the most elaborated dances in the waterbird species. The lake supports a waterbird population of around 1.5 million with about 160 different species. It is a medium-sized waterbird with brown plumage. Significantly, they both include a large waterbird clade (Aequornithes) and a large landbird clade (Telluraves). The proposed waterbird superorder has been suggested. The little crake ("Porzana parva") is a very small waterbird of the family Rallidae. The spotted crake ("Porzana porzana") is a small waterbird of the family Rallidae. The king rail ("Rallus elegans") is a waterbird, the largest North American rail. This common waterbird is found in northern Australia and southern New Guinea. Now it is a very common waterbird that can be found throughout New Zealand .