Kristel Richard / Two cowboys mounted on a Pantaneiro stallion, round up a band of wild Pantaneiro horses, Pantanal, Mato Grosso do Sul, Brazil. August 2015.

Kristel Richard / During the Festa do Colete Encarnado (Red Waistcoat Festival), a bull running festival, a traditionally dressed 'cavalheiro' delivers the 'banderilla' mounted on his Lusitano stallion in the bullring...

Kristel Richard / Portrait of a traditionally dressed estancia owner mounted on his stallion, during the Festa do Colete Encarnado (Red Waistcoat Festival), a bull running festival, in Vila Franca de Xira, District of...

Kristel Richard / A rare Sorraia stallion cantering, Coudelaria Nacional (National Stud Farm), in Alter do Chao, District of Portalegre, Alentejo, Portugal.

Kristel Richard / Portrait of a rare Sorria stallion, Reserva Natural do Cavalo do Sorraia, Alpiarca, District Santarem, Alentejo, Portugal.

Franco Banfi / Zebu bull, Bonito, Mato Grosso do Sul, Brazil

Nick Garbutt / Veterinarian from Oncafari Project setting trap to catch Jaguar (Panthera onca palustris) in order to fit a radio collar. In foreground old and weakened Cow killed by female Jaguar. Caiman Lodge, sout...

David Perpinan / Timelapse of cattle moving in Pantanal landscape, Mato Grosso do Sul, Brazil.

David Perpinan / Giant anteater (Myrmecophaga tridactyla) feeding, with cattle in the background, Pantanal, Mato Grosso do Sul, Brazil.

Kristel Richard / Cowboy mounted on a Pantaneiro stallion, rounding up a band of wild Pantaneiro horses, Pantanal, Mato Grosso do Sul, Brazil. August 2015.

Kristel Richard / Peone or cowboy riding his Pantaneiro stallion, Pantanal, Mato Grosso do Sul, Brazil. August.

Kristel Richard / Cowboy on his Pantaneiro stallion, lassoing a Nelore calf for vaccination, among a herd of Nerole cattle, Pantanal, Mato Grosso do Sul, Brazil. August 2015.

Morley Read / Rio Faisanes stubfoot toad (Atelopus coynei), Carchi Province, Ecuador, 2017. Critically endangered. (non-ex)

Chien Lee / Condoto Stubfoot Toad (Atelopus spurrelli), Utria National Park, Colombia

Lucas Bustamante / Rio pescado harlequin toad (Atelopus balios) pair on branch, female on the left, Azuay, Ecuador, Critically endangered species, possibly extinct.

Michael & Patricia Fogden / Harlequin Frog (Atelopus varius) displaying warning coloration, Monteverde, Costa Rica

ZSSD / Panamanian Golden Frog (Atelopus zeteki) pair in amplexus, native to Panama

Doug Wechsler / Atelopus toad {Atelopus spumarius} Iwokaram mtns, Guyana

Michael & Patricia Fogden / Harlequin Frog (Atelopus varius) displaying colorful warning colors, cloud forest, Costa Rica

Morley Read / Pair of Stubfoot toads (Atelopus) in amplexus, Cordillera del Condor, Zamora Chinchipe Province, Ecuador. (non-ex)

Morley Read / Pair of Stubfoot toads (Atelopus) in amplexus, Cordillera del Condor, Zamora Chinchipe Province, Ecuador. (non-ex)

Morley Read / Pair of Stubfoot toads (Atelopus) in amplexus, Cordillera del Condor, Zamora Chinchipe Province, Ecuador. (non-ex)

Morley Read / Pair of Stubfoot toads (Atelopus) in amplexus, Cordillera del Condor, Zamora Chinchipe Province, Ecuador. (non-ex)

David Perpinan / Assisted feeding in a Panamanian golden frog (Atelopus zeteki) in a captive breeding program. United States. August 2007. Critically endangered. small repro only