Mallard

[Canoncan]

I am guessing mallard. It was with hundreds at Coburg today as I was there to take some photo's of the laughing gull. The black bill is throwing me though.

[Canoncan]

82 Views on a birding sight and no one seems to know? Were my expectations too high?

[JTF]

My call is a Cross Hybrid Mallard. Mallards frequently interbreed with domestic stock, producing a bewildering variety of patterns and colors. They also hybridize with wild species such as the closely related American Black Duck and even occasionally with Northern Pintails.

[Bruce Colvin]

And another whole new species is born.

[Kin Lau]

Or a partial albino American Black Duck. A size would really help to ID.
If it's larger than the typical Mallard or ABD, then it's likely a domestic mix.

[Canoncan]

Thanks guys, size was the same as the mallard females it was with.

[Bruce Colvin]

Mallards are not at all picky who they choose as a mate. Almost any odd duck you find is the product of a Mallard meeting a new friend of any sort. They just won't stay close to home. Always out on the town.