Edwin Giesbers / Horned guan (Oreophasis derbianus) portrait, captive, endangered

Rolf Nussbaumer / Black Guan {Chamaepetes unicolor} adult head on close up, Bosque de Paz, Central Valley, Costa Rica

Luiz Claudio Marigo / Spix's guan {Penelope jacquacu} River Negro, Amazonas, Brazil

Luiz Claudio Marigo / Spix's guan {Penelope jacquacu} River Negro, Amazonas, Brazil

Luiz Claudio Marigo / Spix's guan {Penelope jacquacu} River Negro, Amazonas, Brazil

Oscar Dewhurst / Blue-throated Piping-Guan (Pipile cumanensis) feeding on palm fruits in the Peruvian Amazon. Madre de Dios, Peru. March

Lucas Bustamante / Spix's Guan (Penelope jacquacu) Tambopata National Reserve, Madre de Dios, Peru.

Lucas Bustamante / Spix's guans (Penelope jacquacu) on clay lick, Tambopata National Reserve, Madre de Dios, Peru.

Jed Weingarten / Wild Wonders of China / Tao master at Lou Guan Tai temple, Shaanxi province, China. April 2015.

Alex Hyde / Blue-throated Piping-Guan (Pipile cumanensis) eating riverside clay along the banks of the Manu River, Manu Biosphere Reserve, Amazonia, Peru. November.

Joao Burini / Black-fronted piping guan (Aburria jacutinga), Intervales State Park, Sao Paulo, Atlantic Forest South-East Reserves, UNESCO World Heritage Site, Brazil.

Donald M. Jones / Crested Guan (Penelope purpurascens), Costa Rica