A slender duck with a pointed tail. Male: greyish above; chocolate-brown head and upper neck; thin white stripe up neck side; bronze-green speculum. Female:
mottled buff-brown; pointed tail lacks longer tailpins; whitish belly. Non-breeding male like female, but mantle greyish. In flight, pointed tail between feet distinctive. Highly gregarious; extremely common on vegetation-covered jheels; males often in separate flocks, especially on arrival in winter grounds; crepuscular and nocturnal; characteristic hissing swish of wings as flock flies over.