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

Andy Rouse / RF - Giant Otter (Pteronura brasiliensis) feeding on fish in river, Pantanal, Brazil Medium repro only (This image may be licensed either as rights managed or royalty free.)

Luke Massey / Giant otter (Pteronura brasiliensis) resting on a fallen tree in the Rio Cuiaba, Brazil

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a catfish (Loricariidae) with Cocoi heron (Ardea cocoi) scavenging remnants, Rio Cuiaba, Brazil

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

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.

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

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

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

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

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

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

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

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

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

Karine Aigner / Giant river otter portrait (Pteronura brasiliensis). Yasuni National Park, Orellana, Ecuador. Amazon Rainforest.

Suzi Eszterhas / Giant otter (Pteronura brasiliensis) amongst tree trunks. Pantanal, Brazil.

Suzi Eszterhas / Giant otter (Pteronura brasiliensis) sitting in water. Pantanal, Brazil.

Brandon Cole / Giant river otter (Pteronura brasiliensis), Pantanal wetlands region. Brazil.

Nick Garbutt / RF - Giant Otters (Pteronura brasiliensis) in a lagoon off the Paraguay River, Taiama Reserve, western Pantanal, Brazil. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / Giant Otters (Pteronura brasiliensis) running along a sand bar. Cuiaba River, Pantanal, Brazil.

Sylvain Cordier / RF - Giant otter (Pteronura brasiliensis), resting on a branch above water, Pantanal, Mato Grosso, Brazil. (This image may be licensed either as rights managed or royalty free.)

Sylvain Cordier / Giant otter (Pteronura brasiliensis), feeding on fish, Pantanal, Mato Grosso, Brazil.

Sylvain Cordier / Giant otter (Pteronura brasiliensis), feeding on fish Pantanal, Mato Grosso, Brazil.

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

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

John Shaw / Giant river otter (Pteronura brasiliensis) eating a catfish. Cuiaba River, Pantanal, Brazil, August.

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a Pleco catfish (Loricariidae) Rio Cuiaba, Pantanal, Brazil

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a Pleco catfish (Loricariidae) Rio Cuiaba, Pantanal, Brazil

Luke Massey / Giant river otter (Pteronura brasiliensis) feeding on fish. Pantanal, Brazil. medium repro only

Luke Massey / Giant river otters (Pteronura brasiliensis) fighting, Pantanal, Brazil.

Luke Massey / Giant otter (Pteronura brasiliensis) scratching and yawning, Pantanal, Brazil

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a Pleco catfish (Loricariidae) Rio Cuiaba, Pantanal, Brazil

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a catfish (Loricariidae) with Cocoi heron (Ardea cocoi) scavenging remnants, Rio Cuiaba, Pantanal, Brazil.

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a catfish (Loricariidae) with Cocoi heron (Ardea cocoi) scavenging remnants, Rio Cuiaba, Pantanal, Brazil.

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a Pleco catfish (Loricariidae) Rio Cuiaba, Pantanal, Brazil

Andy Rouse / Giant Otter (Pteronura brasiliensis) swimming , Pantanal, Brazil Motion blur

Andy Rouse / RF - Giant Otter (Pteronura brasiliensis) in river, Pantanal, Brazil (This image may be licensed either as rights managed or royalty free.)

Andy Rouse / RF - Giant Otter (Pteronura brasiliensis) in river, Pantanal, Brazil (This image may be licensed either as rights managed or royalty free.)