Seasonal changes in population dynamics of waterfowl species of the Clifton coast, Karachi, Pakistan was studied for a period of four years. Waterfowl species were classified on the basis of guild structure in order to gather information on foraging habits, diurnal rhythms and diet preference. A detailed ecological characteristic of the study site was given to provide the effect of composition of sediment and water quality on the diet of birds. Fifty three waterfowl species were divided into 6 guilds: 1, Herbivorous; 2, Stalking; 3, Fishing; 4, Visual Surface Foraging; 5; Tactile Surface...