Pete Oxford / Giant otter (Pteronura brasiliensis) in the Rewa River, Iwokrama reserve, Guyana, Endangered species

Mary McDonald / Giant River Otter (Pteronura brasiliensis) playing on falling log, in the Pantanal NP, Brazil, South America

Christophe Courteau / Giant otter (Pteronura brasiliensis) diving into river, Pantanal River, Brazil, July

Eric Baccega / Head portrait of Giant otter (Pteronura brasiliensis) swimming, captive, from Pantanal, Brazil.

Eric Baccega / Giant otter (Pteronura brasiliensis) swimming, captive, from Pantanal, Brazil, IUCN Endangered

Pete Oxford / Giant otters in river {Pteronura brasiliensis} captive, Guyana

Pete Oxford / Giant otter eating a fish {Pteronura brasiliensis} Guyana

Pete Oxford / Giant otter at edge of river {Pteronura brasiliensis} Guyana

Pete Oxford / Giant otter in water {Pteronura brasiliensis} Pantanal, Brazil, South America

Gabriel Rojo / Giant river otter (Pteronura brasiliensis) resting on fallen tree trunk above Cuiaba River. Pantanal, Mato Grosso, Brazil.

Lucas Bustamante / Giant river otter (Pteronura brasiliensis) eating a catfish. Yasuni National Park, Orellana, Ecuador

Lucas Bustamante / Giant river otter (Pteronura brasiliensis) eating a catfish. Yasuni National Park, Orellana, Ecuador