We just returned from very windy Iceland a couple of days ago. This was our target bird and they didn't let us down. Captured this flight as he was flying back up river below the mouth of Lake Myvatn. They would float down river and frequently dive to dine on the river grasses. C&C welcome.
D500, Sigma 150-600mm C @ 600mm, 1/3200s, f 9.0, ISO 1000, hand held.
Geoffrey
http://500px.com/geoffreymontagu