(note that this is a different duck from my other observation; this one has more male coloration and a different beak.)
One of several ducklings in the pond that weren't associating with one particular species (GWTE, GADW, and MALL pairs were present), but I'm assuming Mallard...? I don't know how to ID ducklings by their markings, but I don't think GWTE or GADW commonly breed in our region (though I did see a Gadwall hen with her ducklings last year).
Klamath River, Veteran's park, Klamath Falls, Oregon, USA
Klamath River, Veteran's park, Klamath Falls, Oregon, USA