Caught in flight, a pair of male Shoveler. Just needs one more for the wall set! The most obvious feature is the massive spade-like bill, even from a fleeting glimpse in motion. Note by the way the spelling, with just a single l, the temptation often being to add another.

In briefly researching the breed for this post I was momentarily confused by references to a "Northern Shoveler", for instance on Wikipedia, but this is just another name for the same duck.