Luke Massey / Giant otters (Pteronura brasiliensis) feed on a Golden dorado (Salminus brasiliensis) Pantanal, Brazil.

Tony Heald / Giant Otter (Pteronura brasiliensis) adult with young in water, Pantanal, Brazil

Konrad Wothe / Giant River Otter (Pteronura brasiliensis) swimming, native to South America

Christophe Courteau / Giant Otter swimming (Pteronura braziliensis) Pixiam river, Pantanal, Mato Grosso, Brazil.

David Pattyn / Giant otter (Pteronura brasiliensis) running at the edge of a river while playing with a family member, Rio Tres Irmaos, Pantanal, Brazil

Paul Williams / Giant otter (Pteronura brasiliensis) adult playing with plastic bottle, Pantanal, Pocone, Brazil

Luiz Claudio Marigo / Two Giant Otter / Giant Brazilian Otter (Pteronura brasiliensis) sunbathing on a tree trunk. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Pete Oxford / Giant Otters (Pteronura braziliensis) at den in river bank, Mato Grosso, Pantanal, Brazil. Endangered species

Pete Oxford / Diane McTurk carrying a Giant otter (Pteronura brasiliensis) into the river, habituated, Karanambu Otter Trust for re-introduction, Rupununi, Guyana, Endangered species, August 2009

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