Buffleheads

A surprise visit from a group of Bufflehead ducks (a first for me). I wonder whether the group comprises a pair with three first year males because the latter have the same markings as a female and the middle one is slightly larger. Apparently they are monogamous.

The male is quite striking and its green forehead is just visible. They disappeared underwater for quite some time, leading me to guess where to look for them next.

I read they nest exclusively in Northern Flicker woodpecker holes and I know we have had a number of those about.