Cee reminded me today of ducks and then I remembered swans and specifically, sleeping swans, floating on the pond with their long necks and heads tucked under a wing. And how those necks are so long, they don’t have to dive for food (usually), but just crane their necks down into the water.
It took a while, but I found the picture I was looking for. It’s this last one.
The head and necks of swans are never white. They are always a bit grungy and muddy. It’s only from a distance that they look white all over.