Tufted Duck - The male is usually identified easily by the tuft of feathers at the back of the head. A loan female is sometimes confused with the Scaup. Both sexes have very bright yellow circular iris in large eyes with distinctive large, dark pupil. Taken around Derbyshire and Nottinghamshire.
▼ Video Clip
▼ Tufted Duck at Attenborough Nature Reserve Nottinghamshire