Best time to see: mid Sep to Apr

Key facts

Large saw-billed duck found mainly on fresh water

Habitat: freshwater lakes, rivers and reservoirs

Breeds in forested areas in N. Britain; winters in southern Britain

Recognition

Male, white and black upperparts, bottle green head with long thin red bill; female greyish with rusty head; 65 cm

Ungainly on land but strong swimmers underwater, diving for fish

Flight strong and powerful