These are definitely the strangest looking ducks I've seen. They could puff up their head and neck to about the same size as the rest of their body.
This is what the duck looked like normally:
Sorry the pictures are a bit pixelated. The ducks were a fair distance from my condo window. I had to zoom in and crop the pictures to show the details. Then the automated program I wrote for posting the photos automatically scaled the images to a width of 600 pixels. Normally this scaling to 600 pixels is a good thing as most of my photos are hi-res and are much wider than that. But since these pictures were tiny crops smaller than 600 pixels wide to begin with, they got blown up instead.