Young Batak woman performing courtship dance, bowl of water and leaves symbolising commitment, Huta Bolon, Simanindo, Sumatra, Indonesia, Southeast Asia, Asia

Adult Nazca booby (Sula grantii) pair in courtship in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

Black-browed Albatross (Thalassarche melanophrys) adult courtship dance in the Falkland Islands.

Silhouette, two cranes (grus grus) calling with breath at sunrise, dance of the cranes, bird migration, Vaestergoetland, Sweden, Europe

Cranes (grus grus) perform courtship display with flapping wings, Dance of the Cranes, Vaestergoetland, Sweden, Europe

Silhouette of Grey Common cranesn (grus grus), pair of animals, courtship at sunrise, dance of the cranes, Vaestergoetland, Sweden, Europe

Great Crested Grebes (Podiceps cristatus) doing a mating dance, Canton of Vaud, Switzerland, Europe