Methods employed for bird counting comprise thoroughly censuses along the 4 determined routes by boats and field surveys along the 4 determined routes by boats and field surveys on foot in some upland areas every month. As high as 149 bird species in 110 genera, 40 families and 15 orders were recorded, of which 116 are residents and 33 are seasonal migrants. The populations of the Purple Gallinule, Porphyrio porphyrio (Linnaeus) was the highest (7,989), followed by the Whistling Teal, Dendrocygna javanica (Horsfield) and the Cotton Teal, Nettapus coromandelianus (Gmelin) with the population numbering 6, 670 and 4,483 birds respectively. January to April was the period of high bird population while July to October the bird population was low. The species diversity and population density varied greatly according to the types of bird species and some certain enviromental factors such as: temperature, seasonal variation, rainfall, water level, and salinity