My husband says your duck is a hooded merganser and he said they are diving ducks, he also said it is a drake, (male duck).
We see this ring around the moon down here. When I was young I remember one of the old timers saying when you see the ring, shrimping is will be good.
Oh okay, I looked at the hooded merganser but it does not seem to have an iridescent coat color to it.
Good to know.