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 2015 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 27th of January 2015 the whole area of the Zobnatica lake was observed, as well as the Krivaja creek completely to Đurđin.
In our observation area the most important waterbird species were the following: Mallard (Anas platyrhynchos) 64, Common Coot (Fulica atra) 57, Reed Bunting (Emberiza schoeniclus) 27, Mute Swan (Cygnus olor) 16, Penduline Tit (Remiz pendulinus) 9, Goldeneye (Bucephala clangula) 2, Bearded Tit (Panurus biarmicus) 2 and Grey Heron (Ardea cinerea) 1. Totally 178 birds belonging to 8 species were observed.