David Pattyn / Red necked grebe (Podiceps grisegena) approaching a competitor in an attempt to drive him away during the courting season, Danube area, Bulgaria, April

Gerrit Vyn / Adult Red-necked Grebes (Podiceps grisegena) in breeding plumage performing "whinny-braying" duet in defense of territory. Fairbanks, Alaska, USA, July.

Markus Varesvuo / Red-necked grebe (Podiceps grisegena) on water. Latvia. April.

Loic Poidevin / Red necked grebe (Podiceps grisegena) sitting on nest amongst water lilies and reeds. Danube Delta, Romania. May.

Sven Zacek / Red-necked grebe (Podiceps grisegena) sitting on its nest, Tartumaa, Estonia, May.

David Tipling / Red-necked Grebe (Podiceps grisegena) swimming in water filled gravel pit, Kent, England, UK. Winter

Markus Varesvuo / Red-necked grebe (Podiceps grisegena) migrating flock in flight, Finland, May

Markus Varesvuo / Red-necked Grebe (Podiceps grisegena), adult with summer plumage in a lake carrying nesting material. Ristiina, Finland.

Hanne & Jens Eriksen / Red necked grebe (Podiceps grisegena) family at nest, Denmark, May

Hanne & Jens Eriksen / Red necked grebe (Podiceps grisegena) family at nest, Denmark, May

David Pattyn / Red-necked Grebe (Podiceps grisegena) pair displaying during courtship. Bulgaria. April.

David Pattyn / Red-necked Grebe (Podiceps grisegena) in defensive posture in the breeding season. Bulgaria. April.