Can you identify this duck?

[davetuc]

A large sized duck, the male has a dark, green head, female head is reddish/brown. Name has either 'sun', 'sea', or 'sand' in it.

[marybank]

It is a goosander!

[Mr Veritas]

Just to back up marybank's answer.
Here is a picture of a pair of Goosander's:~

http://www.alfredericksson.co.uk/photographs/b irds/goosander/

[sara3]

not Jemima then?

[davetuc]

Cheers all!!!
This site always comes up trumps!

[Billy Reid S]

The first one that comes to mind is the Shellduck,
The male has a green head but the rest of it is nearly all
black and white with a bit of brown. Other male ducks with green heads are Mallard, Shoveler, Goldeneye, Gooseanderand and perhaps the Merganser.
The females of all these species have brown heads
except the Shellduck which has a lot of white on it.
Not a lot of help I'm afraid!