Definition of pure luck: to capture a Black-throated Loon late December in full breeding plumage, on the last remaining patch of liquid water in a huge frozen lake, close to the shore, front light !
The funniest moment of that session (and one of the funniest ever in my bird photo career) was when the breeding-plumage loon took a dive...
...and a few seconds later it emerged back to the surface, in winter plumage !...
That was no real mystery, of course: there were simply two Black-throated Loons :)
