David Perpinan / Two Chaco chachalacas (Ortalis canicollis) fighting, Pantanal, Mato Grosso do Sul, Brazil.

David Perpinan / Two Chaco chachalacas (Ortalis canicollis) fighting, Pantanal, Mato Grosso do Sul, Brazil.

David Perpinan / Chaco chachalaca (Ortalis canicollis) perched in a tree, looking around, Pantanal, Mato Grosso do Sul, Brazil.

David Perpinan / Chaco chachalaca (Ortalis canicollis) vocalising in a tree, Pantanal, Brazil, October.

Luiz Claudio Marigo / Chaco Chachalaca (Ortalis canicollis) Pantanal, Mato Grosso, Western Brazil.

Hermann Brehm / Chaco Chachalaca (Ortalis canicollis) calling, Pantanal, Brazil.

Hermann Brehm / Chaco Chachalaca (Ortalis canicollis) rear view, Pantanal, Brazil.

Luiz Claudio Marigo / Chaco Chachalaca (Ortalis canicollis) on the forest floor. The Pantanal wetlands of Mato Grosso State, Brazil, November.

Gabriel Rojo / Chaco chachalaca {Ortalis canicollis} Argentina

Gabriel Rojo / Chaco chachalaca pair {Ortalis canicollis} Argentina

Pete Oxford / Chaco Chachalaca (Ortalis canicollis), Pantanal, Mato Grosso, Brazil