Danny Green / Black-throated diver (Gavia arctica), Finland, June.

Danny Green / Black-throated diver (Gavia arctica) displaying, Finland, June.

Danny Green / Black-throated diver (Gavia arctica) on near waters edge, Finland, June.

Markus Varesvuo / Black-throated diver (Gavia arctica) on water, Finland, May.

Markus Varesvuo / Black-throated diver (Gavia arctica) on water, Finland, May.

Markus Varesvuo / Black-throated diver (Gavia arctica) portrait, Finland, June

Juan Carlos Munoz,Juan Carlos Munoz / Black throated diver (Gavia arctica) displaying, Norway, June.

Laurie Campbell / Black-throated diver (Gavia arctica) Loch Maree, Beinn Eighe National Nature Reserve, Wester Ross, Scotland, June

Markus Varesvuo / Black-throated Diver (Gavia arctica) Vaala Finland June

Orsolya Haarberg / Black-throated diver (Gavia arctica) portrait on water, Pasvik, Finmark, Norway, June

Werner Bollmann / Black-throated diver (Gavia arctica) Hallefors, Sweden, June.

Jussi Murtosaari / Black-throated diver (Gavia arctica), adult displaying, Finland, September