Since 2011, The International Waterbird Census (IWC) in Serbia is coordinated by Bird Study and Protection Society of Serbia. The IWC is coordinated by Wetlands International and it is organized every year in most countries of the world. In 2017 the period of observations was between 10th and 30th of January and the results of waterbird counting had to be provided the IWC until 15th of February.
Ornithologists from Ornithological work group of Arcus Ecological Association participate in national survey since 2012. On 25th of January 2017 the whole area of the Zobnatica lake was observed, as well as the Krivaja creek completely to Đurđin. Later the Krivaja creek was observed from area near Bačka Topola to Bajša.
In our observation area the most important waterbird species were the following: Mallard (Anas platyrhynchos) 153, Reed Bunting (Emberiza schoeniclus) 86, Moorhen (Gallinula chloropus) 9, Mute Swan (Cygnus olor) 5, Grey Heron (Ardea cinerea) 4, Pygmy Cormorant (Phalacrocorax pygmeus) 2, Great Cormorant (Phalacrocorax carbo) 1, Great Egret (Egretta alba) 1, Mandarin Duck (Aix galericulata) 1, Northern Harrier (Circus cyaneus) 1 and Water Rail (Rallus aquaticus) 1. Totally 264 birds belonging to 11 species were observed.