Sebastian Kennerknecht / American Black Vulture (Coragyps atratus) flying near skyscrapers, Ancon Hill, Panama City, Panama

Francisco Marquez / Griffon vultures (Gyps fulvus) and European black vultures (Aegypius monachus) feeding on a dead deer, Cabaneros National Park, Montes de Toledo, Spain, May.

Bence Mate / Black vulture (Coragyps atratus) squabbling with King vulture (Sarcoramphus papa) Costa Rica.

Bence Mate / Black vulture (Coragyps atratus) face to face with King vulture (Sarcoramphus papa) Costa Rica.

Denis-Huot,Denis-Huot / Lappet-faced vultures (Torgos tracheliotus) interacting, Masai-Mara Game Reserve, Kenya,

Claudio Contreras / California condor (Gymnogyps californianus) preening, IUCN Critically Endangered, captive.

Claudio Contreras / California condor (Gymnogyps californianus), IUCN Critically Endangered, captive.

Claudio Contreras / California condor (Gymnogyps californianus), IUCN Critically Endangered, captive.

Bence Mate / Head portrait of King vulture (Sarcoramphus papa) Santa Rita, Costa Rica

Fabrice Cahez / Eurasian griffon vulture (Gyps fulvus) in flight above clouds, Gorges du Tarn, France, January.

Fabrice Cahez / Eurasian griffon vulture (Gyps fulvus) in flight above clouds, Gorges du Tarn, France, January.

Martin Gabriel / Four Griffon Vultures (Gyps fulvus) in flight, silhouetted overhead. Monfrague National Park, Extremadura, Spain, March.