Long-term monitoring of bird numbers in India has been carried out for waterfowl species (Perennou et al. 1994), and for grassland birds such as the Great Indian Bustard (Rahmani and Manakadan 1988) and floricans (Narayan et al. 1989). Other migrants such as raptors have not been regularly monitored. Being at the pinnacle of the food chain, raptors deserve more attention on their wintering grounds (Newton 1979). The migrant raptors which winter throughout the Indian subcontinent include several species of harriers Circus (Ali and Ripley 1983), which congregate in large numbers at grasslands for roosting (Rahmani and Manakadan 1986, Clarke 1996a, Kanniah and Ganesh in press).