Whether or not they are the same pair from last year, who knows. But I do know mating pairs of ducks are generally monogamous and stay with the same partner for life. But if they return to the same spot year in and year out, that I don't know.
My younger brother ripped off a 10km a few weeks ago and he hit a very respectable time of 42:30. He also had the cheering squad going and all that. Maybe he'll be a potential member of our Cabot Trail relay team in another year if we decide to do it again? Who knows. Keep going!