Tufted Duck

Aythya fuligula

male

female

Appearance:
Medium-sized diving duck
Grey-blue bill
Yellow eye
Male:
   Black with white flanks
   Long, black head tuft (less prominent in non-breeding plumage)
Female:
   Brown with paler flanks
Juvenile:
     Similar in appearance to female
     Colour less vibrant
     Tuft less pronounced

Although similar in appearance to the Scaup, which I am familiar with, the long head tuft on the male made this fellow immediately stand out.  He is just one of the many ducks that frequent the Boating Lake in Regent's Park.

Learn more about the Tufted Duck.