Pete Oxford / Giant River Otter (Pteronura brasiliensis), Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating fish, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) walking along shore, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) in shallow water, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) on riverbank, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating Black Piranha (Serrasalmus rhombeus), Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating Black Piranha (Serrasalmus rhombeus), Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating Black Piranha (Serrasalmus rhombeus), Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating Black Piranha (Serrasalmus rhombeus), Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) playing with Macushi boy, Karanambu Trust for re-introduction, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating fish, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating fish, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating fish, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) eating fish, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) swimming, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) swimming, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) on riverbank, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) on riverbank, Karanambu Trust, Rupununi, Guyana

Pete Oxford / Giant River Otter (Pteronura brasiliensis) trio on riverbank, Rewa River, Guyana

Luciano Candisani / Giant River Otter (Pteronura brasiliensis) feeding on Catfish (Pseudoplatystoma corruscans), southern Pantanal, Mato Grosso, Brazil

Luciano Candisani / Giant River Otter (Pteronura brasiliensis) feeding on Catfish (Pseudoplatystoma corruscans), southern Pantanal, Mato Grosso, Brazil

Piper Mackay / Giant otter (Pteronura brasiliensis) swimming in river, Pantanal, Brazil, Endangered species

Piper Mackay / Giant otter (Pteronura brasiliensis) feeding on fish in river, Pantanal, Brazil, Endangered species

Piper Mackay / Giant otter (Pteronura brasiliensis)swimming in river, Pantanal, Brazil, Endangered species

Piper Mackay / Giant otter (Pteronura brasiliensis) feeding on fish in river, Pantanal, Brazil, Endangered species

Piper Mackay / Giant otter (Pteronura brasiliensis) swimming in river, Pantanal, Brazil, Endangered species

Piper Mackay / Giant otter (Pteronura brasiliensis) feeding on fish in river, Pantanal, Brazil, Endangered species

Luciano Candisani / Giant River Otter (Pteronura brasiliensis) swimming towards camera, Rio Negro, Brazil

Luciano Candisani / Giant River Otter (Pteronura brasiliensis) lifting head out of water, Rio Negro, Brazil

Konrad Wothe / Giant River Otter (Pteronura brasiliensis) pair fighting over fish prey, Tambopata National Reserve, Peru

Andy Rouse / Giant otter (Pteronura brasiliensis) on river bank, Brazil

Andy Rouse / Giant otter (Pteronura brasiliensis) standing alert in water, Brazil

Mark Bowler / Giant river otter (Pteronura brasiliensis) in Yavari River, wild, Amazonian rainforest, Peru, Endangered species

Mark Bowler / Giant river otter (Pteronura brasiliensis) pair in Yavari River, wild, Amazonian rainforest, Peru, endangered species

Suzi Eszterhas / Giant River Otter (Pteronura brasiliensis) swimming, Pantanal, Brazil

Suzi Eszterhas / Giant River Otter (Pteronura brasiliensis) swimming, Pantanal, Brazil

Staffan Widstrand / Giant otter {Pteronura brasiliensis} pair on river bank, Pantanal, Brazil, September

Luiz Claudio Marigo / Giant Brazilian Otters (Pteronura brasiliensis) resting on river bank, Pixaim River, Pantanal Matogrossense, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Guide feeds Giant Brazilian Otter (Pteronura brasiliensis) to attract it to tourist boat, Pixaim River, Pantanal Matogrossense, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Giant Brazilian Otter (Pteronura brasiliensis) and a Jabiru stork (Jabiru mycteria) Pixaim River, Pantanal Matogrossense, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Family of Giant Brazilian Otters (Pteronura brasiliensis) in Pixaim River, Pantanal Matogrossense, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Giant Brazilian Otter (Pteronura brasiliensis) coming out of its den in Pixaim River, Pantanal Matogrossense, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Giant Brazilian Otters (Pteronura brasiliensis) in Pixaim River, Pantanal Matogrossense, Mato Grosso State, Western Brazil.

Kevin Schafer / Giant River Otter (Pteronura brasiliensis) peeking out of water amid Common Water Hyacinth (Eichhornia crassipes) plants, Pantanal, Brazil

Kevin Schafer / Giant River Otter (Pteronura brasiliensis) eating fish, Peru

Kevin Schafer / Giant River Otter (Pteronura brasiliensis) eating fish, Oxbow Lake, Peru

Theo Allofs / Giant River Otter (Pteronura brasiliensis) feeding on fish, Pantanal, Brazil

Konrad Wothe / Giant River Otter (Pteronura brasiliensis) eating Blacktail Piranha (Pygocentrus piraya), Pantanal, Brazil

Konrad Wothe / Giant River Otter (Pteronura brasiliensis) eating Blacktail Piranha (Pygocentrus piraya), Pantanal, Brazil

Theo Allofs / Giant River Otter (Pteronura brasiliensis) pair, an endangered species, curiously raising heads above water, Pantanal, Brazil

Theo Allofs / Giant River Otter (Pteronura brasiliensis) an endangered species, eating fish in shallow water with Jacare Caiman (Caiman yacare) approaching, Pantanal, Brazil

Theo Allofs / Giant River Otter (Pteronura brasiliensis) an endangered species, swimming, Pantanal, Brazil

Theo Allofs / Giant River Otter (Pteronura brasiliensis) an endangered species, swimming, Pantanal, Brazil

Theo Allofs / Giant River Otter (Pteronura brasiliensis) an endangered species, holding fish in mouth, Pantanal, Brazil

Nick Gordon / Giant otter (Pteronura brasiliensis) faces off against Anaconda (Eunectes murinus) Guyana, South America

Nick Gordon / Family of Giant otters (Pteronura brasiliensis) resting up on river bank, Guyana

Nick Gordon / Giant otter (Pteronura brasiliensis) hunting for fish underwater, Amazonia, Brazil

Nick Gordon / Giant otter (Pteronura brasiliensis) feeding on Piranha fish, Amazonia, Brazil

Hermann Brehm / Giant otter outside riverside den {Pteronura brasiliensis} Pantanal, Brazil

Pete Oxford / Giant otter {Pteronura brasiliensis} Karanambu, Rupununi, Guyana

Pete Oxford / Giant otter {Pteronura brasiliensis} on riverbank, Karanambu-Rupununi, Guyana

Pete Oxford / Giant otter eating a fish {Pteronura brasiliensis} Karanambu-Rupununi, Guyana

Pete Oxford / two Giant otters sniffing in greeting {Pteronura brasiliensis} Karanambu-Rupununi, Guyana

Pete Oxford / Giant otter {Pteronura brasiliensis} resting on river bank, Karanambu-Rupununi, Guyana

Pete Oxford / Giant otter {Pteronura brasiliensis} feeding on a fish, Karanambu-Rupununi, Guyana

Pete Oxford / Giant otters {Pteronura brasiliensis} playing by river bank, Karanambu-Rupununi reserve, Guyana

Pete Oxford / Giant otter front portrait {Pteronura brasiliensis} Karanambu-Rupununi, Guyana

John Cancalosi / Giant otter {Pteronura brasiliensis} feeding on fish, Venezuela, captive, endangered species

Pete Oxford / Giant otters (Pteronura brasiliensis) swimming at river surface, Manu NP, Peru, South America

Luiz Claudio Marigo / Giant otter eating fish, Pixaim river, Pantanal, Mato Grosso, Brazil {Pteronura brasiliensis}

Luiz Claudio Marigo / Giant otter, Pixaim river, Pantanal, Mato Grosso, Brazil {Pteronura brasiliensis}

Luiz Claudio Marigo / Giant otter drinking, Pixaim river, Pantanal, Mato Grosso, Brazil {Pteronura brasiliensis}

Luiz Claudio Marigo / Tourists watching Giant otter {Pteronura brasiliensis} Pixaim river, Pantanal Brazil

Pete Oxford / Giant otter {Pteronura brasiliensis} captive, Guyana

Pete Oxford / Giant otters feeding on fish {Pteronura brasiliensis} Manu NP, Peru

Staffan Widstrand / Giant otter running along river bank {Pteronura brasiliensis} Pantanal, Brazil.

Pete Oxford / Giant otter swimming {Pteronura brasiliensis} Manu NP, Peru

Staffan Widstrand / Giant otter swimming {Pteronura brasiliensis} Pantanal, Brazil.

Claus Meyer / Giant River Otter (Pteronura brasiliensis) pair on land, Pantanal, Brazil

Claus Meyer / Giant River Otter (Pteronura brasiliensis) pair at river's edge, Pantanal, Brazil

Claus Meyer / Giant River Otter (Pteronura brasiliensis) eating fish, Pantanal, Brazil

Claus Meyer / Giant River Otter (Pteronura brasiliensis) eating in river, Pantanal ecosystem, Brazil

Claus Meyer / Giant River Otter (Pteronura brasiliensis) eating fish, Pantanal, Brazil

Claus Meyer / Giant River Otter (Pteronura brasiliensis) calling from river, Pantanal, Brazil

Claus Meyer / Giant River Otter (Pteronura brasiliensis) pair in river, Pantanal, Brazil

Claus Meyer / Giant River Otter (Pteronura brasiliensis) trio in river, Pantanal, Brazil

Konrad Wothe / Giant River Otter (Pteronura brasiliensis) eating Blacktail Piranha (Pygocentrus piraya), Pantanal, Brazil

Flip Nicklin / Sea Otter (Enhydra lutris) floating among Giant Kelp (Macrocystis pyrifera), California

Hermann Brehm / Giant otter sniffing the ground {Pteronura brasiliensis} Pantanal, Brazil

Hermann Brehm / Giant otter female coming out of water {Pteronura brasiliensis} Pantanal, Brazil

Hermann Brehm / Riverside den of Giant otter {Pteronura brasiliensis} Pantanal, Brazil

Pete Oxford / Giant otter and baby at den entrance {Pteronura brasiliensis} Manu National Park. Amazon Rainforest Peru South America

Nick Gordon / Giant otter eating fish (Pteronura brasiliensis)

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

Pete Oxford / Giant otter swimming {Pteronura brasiliensis} head close-up. Pantanal, Brazil, South America

Pete Oxford / Giant otter on river bank {Pteronura brasiliensis} Pantanal, Brazil