Abstract
Sex ratio of wintering waterfowl was studied in selected waerbodies in northern suburb of Secunderbad during winter season from 1993-94 to 1996-97. Imbalance in sex ratio was observed in Shoveller and Pintail (mase biased), Gadwall and Wigeon (1:1) and Common Teal (female biased). Among the species studied, the number of males per 100 females in population varied between 65.24+ 1.83 (Common Teal) and 222.15+0.003 (Shoveller)