Males are unmistakable. Females and juveniles resemble other female and immature dabbling ducks.
Nest sites vary, mostly in ground where hidden in vegetation.
Common throughout Ireland.
Only likely to be confused with Whooper and Bewick's Swans in Ireland.
Clutch: 4-7 eggs (1 brood) Incubation: 34-45 days. Fledging: 120-150 days (precocial). Age of first breeding: 3 years. Breeds on lakes, ponds & rivers, and nests are a large mound constructed from reed stem and other aquatic vegetation, with seaweed being