Gabriel Rojo / Great black hawk (Buteogallus urubitinga) perched on branch. Pantanal, Mato Grosso, Brazil.

Franco Banfi / Great black hawk (Buteogallus urubitinga) juvenile, Pantanal, Mato Grosso, Brazil

Franco Banfi / Great black hawk (Buteogallus urubitinga). Pantanal, Mato Grosso, Brazil

Thomas Marent / Great Black Hawk (Buteogallus urubitinga), Pantanal, Mato Grosso, Brazil

Thomas Marent / Great Black Hawk (Buteogallus urubitinga), Pantanal, Mato Grosso, Brazil

Tony Heald / Great black hawk (Buteogallus urubitinga) immature perched in tree with prey, Argentine black and white tegu (Tupinambis merianae) Pantanal, Brazil

Wim van den Heever / Great black hawk (Buteogallus urubitinga) trying pick up a small piece of debris from a river, Pantanal, Brazil.

Ben Cranke / Great Black Hawk (Buteogallus urubitinga) on a river bank, Mato Grosso, Pantanal, Brazil. July.

Luiz Claudio Marigo / Black Hawk (Buteogallus urubitinga) holding a fish in its claws with wings spread, on the shore of Pixaim River at The Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

David Pattyn / Great black hawk (Buteogallus urubitinga) with a freshly caught fish in talons, Pantanal, Mato Grosso, Brazil, August

Pete Oxford / Great Black Hawk (Buteogallus urubitinga), Yasuni National Park, Amazon, Ecuador

Luiz Claudio Marigo / Great Black Hawk (Buteogallus urubitinga) perched in a tree. Mato Grosso State, Brazil, October.