The Black-throated Diver is a scarce breeder on lochs in the north and west of Scotland. It is more numerous in winter when the northern migrants arrive and it can be found along shores and estuaries, mostly in the west. Unusually, one of the birds photographed here was on an inland reservoir, Glanderston Dam, on the upland area between Neilston and Newton Mearns near Glasgow. I think this is a juvenile bird.
The photos from Lochindorb were ruined by a dark, gloomy and drizzly morning. These are a breeding pair in very smart plumage.