Oil and sewage pollution also threaten this duck.
Retrieved from Wikipedia CC BY-SA 3.0
This, along with run-off from nearby cattle stocks and sewage pollution, has caused eutrophication of the river waters.
Retrieved from Wikipedia CC BY-SA 3.0
All of these suffer from problems of degradation resulting from sewage pollution, deforestation and uncontrolled urban expansion in watershed areas.
Retrieved from Wikipedia CC BY-SA 3.0