Kristel Richard / Eagle hunter mounted on Mongolian horse with his female Golden eagle (Aquila chrysaetos) at Eagle Hunters Festival, near Sagsai, Bayan-Ulgii Aymag, Mongolia. September 2014..

Bryan and Cherry Alexander / Chukchi girls, with their family's ancestral clan mark painted in reindeer blood on their face, a ritual during the Chukchi 'Festival of the Young Reindeer' during which young reindeer are sacrificed....

Peter Lewis / Fireworks over the London Eye on New Years Eve 2012. London, England, UK.

Tim Laman / Huli 'singsing' dance ceremony. Huli wigmen wearing human hair wigs and feathers of various birds of paradise and other bird species. Tari Valley, Southern Highlands Province, Papua New Guinea. Novem...

Laurent Geslin / Women dressed in white during the St Marie celebration procession in the street of Gondhar, North Ethiopia, 2006

Juergen Freund / A sing-sing performance, known as laklakau in the Tigak language, by Enuk villagers. Villagers sing and dance to show off their traditional rituals and identity. The sing-sing is performed as a celebr...

Mark Taylor / Blue-and-white Jack Russell Terrier puppy, Scamp, wearing a party hat.

Tui De Roy / Waved Albatross (Phoebastria irrorata) courtship dance under rainy season clouds, Punta Cevallos, Espanola Island, Galapagos Islands, Ecuador

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair calling and jumping during courtship, Hokkaido, Japan

Tui De Roy / Antipodean Albatross (Diomedea antipodensis) courtship display often pirouetting with outstretched wings, Adams Island, Auckland's Group, New Zealand

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair performing courtship dance, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) courting males vying for female's attention, Genovesa Tower Island, Galapagos Islands, Ecuador