Lake Kolleru Wildlife Sanctuary, a vast shallow wetland habitat, is the sole Ramsar-designated wetland in Andhra Pradesh, India (Ramsar 2002, FAO 2006). It serves as a natural flood-balancing reservoir between the deltas of the Krishna and Godavari Rivers (Nagabhatla and others 2009) and is a source of water for domestic use and irrigation (Venot and others 2008). In spite of its protected status the wetland is under threat.