More pics of Tufted / Scaup for discussion

After some discussion whether the 'ducks' photographed yesterday at ringstone, here are all my pictures, the larger blown up pictures are on pages 2 & 3 and the originals on page 1. All comments welcome!

http://s70.photobucket.com/albums/i113/akisby2006/#!cpZZ2QQtppZZ20

I had one reply on birdforum which said "it looks less scaup like in the other photos, and the broad black tip to the bill rules this out - scaup have just a black nail."

Thanks,

Andy