Best time to see: mid Sep to end Apr

Key facts

Small stocky seaduck with long extended tail feathers

Breeds in Iceland and Scandinavia, visiting mostly northern Britain in winter, although some birds come further south

Recognition

Male black and white with long tail feathers; female dark brown with dark face patch and short stumpy tail; 55 cm

Swims and dives for crustaceans and molluscs, often for long periods of time; fast flight