One of the main reasons we chose to go to Iceland in May was to see the Barrow's Goldeneyes in breeding plumage, before they went into molt and made themselves scarce. Conditions were tough, but we did get some keepers. This was shot on the Laxa River near Lake Myvatn.
D500, Sigma 150-600C @ 600mm, ISO 800, 1/6400s @ f/7.1 manual.