Hybrid duck?

Mallard and pacific black cross, or something different? Taken at Mill Park Lakes, Victoria, Australia.

And another view.

With the white eye and the bluish bill, maybe it is a cross with a hardhead.....

Its deinitely not a mallard-black duck hybrid, they look pretty much like a mallard, I think it might be a domestic duck/black duck hybrid. I don't know if hardheads can breed with mallards/black ducks.

Hybrid duck

Looks to me like domestic [mallard-type] x domestic Muscovy Duck. Look at the shape & stance.

I would have said domestic.

If domestic, then why would it have a beak colour/pattern like a hardhead?

Domestic was also my first thought .... and also my second

This is a domestic mallard x domestic muscovy cross , a so called mule duck