I'm thinking this might be a Mallard Muscovy Duck hybrid?
http://img.photobucket.com/albums/v319/sueKay/_DSC0899_zpse51d0190.jpg
http://img.photobucket.com/albums/v319/sueKay/_DSC0903_zpscbb8e39a.jpg
It was one of two drakes that were much larger than regular Mallards. The other one had plumage almost completely identical to the other ducks, but this one's a wee bit different! The other ducks were slightly hostile to it, nipping at it occasionally.
And here's the other large one:
http://img.photobucket.com/albums/v319/sueKay/_DSC0907_zpsac7d6a62.jpg
http://img.photobucket.com/albums/v319/sueKay/_DSC0899_zpse51d0190.jpg
http://img.photobucket.com/albums/v319/sueKay/_DSC0903_zpscbb8e39a.jpg
It was one of two drakes that were much larger than regular Mallards. The other one had plumage almost completely identical to the other ducks, but this one's a wee bit different! The other ducks were slightly hostile to it, nipping at it occasionally.
And here's the other large one:
http://img.photobucket.com/albums/v319/sueKay/_DSC0907_zpsac7d6a62.jpg