Greg Oakley/ BIA / Rufous Whistler (Pachycephala rufiventris) male calling, Victoria, Australia

Jussi Murtosaari / Goldeneye (Bucephala clangula) with chicks swimming behind, Helsinki, Uusimaa, Finland, May.

Oscar Dewhurst / Hikers walking along trail through wildflowers in alpine landscape. Whistler, British Columbia, Canada. August

Oscar Dewhurst / Wildflowers in alpine meadow, view to snow capped mountains and valley below. Whistler, British Columbia, Canada. August 2017.

Konrad Wothe / Goldeneye (Bucephula clangula) courtship display, Germany. April.

Markus Varesvuo / Goldeneye chick (Bucephala glangula) on water, Vaala, Finland, July.

Laurie Campbell / Goldeneye (Bucephala clangula) male bird in river Tweed Estuary, Berwick-upon-Tweed, Northumberalnd, England, February.

Eric Medard / Female Goldeneye (Bucephala clangula) on lake, Sweden, April.

Eric Medard / Female Goldeneye (Bucephala clangula) on lake, Sweden, April.

Eric Medard / Male Goldeneye (Bucephala clangula) stretching wings, Sweden, May.

Eric Medard / Pair of Goldeneyess (Bucephala clangula) gmating, Sweden, May.

Eric Medard / Pair of Goldeneyes (Bucephala clangula) displaying, Sweden, May.