Patricio Robles Gil / Silhouetted Capivara / Capibara (Hydrochoerus hydrochaeris) with Cattle Tyrant (Machetornis rixosa), which feeds on flies approaching the Capibara. Parana, Southern Brazil.

Luiz Claudio Marigo / Capybara (Hydrochoeris hydrochaeris) mother with two suckling infants. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Francois Savigny / Wild female Puma (Felis concolor) with capybara (Hydrochoerus hydrochaeris) kill, Llanos, Venezuela, South America

Francois Savigny / Wild female Puma (Felis concolor) with Capybara (Hydrochoerus hydrochaeris) kill, Llanos, Venezuela, South America

Francois Savigny / Wild female Puma (Felis concolor) with Capybara (Hydrochoerus hydrochaeris) kill, Llanos, Venezuela

Francois Savigny / Capybara in swamp {Hydrochoerus hydrochoerus}, Llanos, Hato El Frio, Venezuela, South America

Barrie Britton / Group of Capybaras (Hydrochoerus hydrochaeris) on riverbank near Port Jofre, Pantanal, Brazil. Taken on location for BBC Wild Brazil series.

Tony Heald / Capybara (Hydrochoerus hydrochaeris) female with young, also with Cattle tyrant (Machetornis rixosa) on her back, Pantanal, Brazil

Luiz Claudio Marigo / Family of Capybaras (Hydrochoerus hydrochaeris) on river bank of Cuiaba River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Family of Capybaras (Hydrochoerus hydrochaeris) in Cuiaba River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Family of Capybaras (Hydrochoerus hydrochaeris) on river bank of Cuiaba River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Capybaras (Hydrochoerus hydrochaeris) Pixaim River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Christophe Courteau / Capybara (Hydrochaeris hydrochaeris) sunning on riverbank, Pantanal, Brazil.

Ben Lascelles / Capybaras (Hydrochoerus hydrochaeris) emerging from water in wetland habitat. Ibera Wetlands Provincial Nature Reserve, Corrientes, Argentina, October.

Pete Oxford / Capybara {Hydrochoerus hydrochaeris} with Flycatcher perched on its back, Panatanal, Brazil

Patricio Robles Gil / Capivara / Capibara (Hydrochoerus hydrochaeris) family resting on river sand bank. Piquiri River, Parana, Southern Brazil.

Patricio Robles Gil / Capivara / Capibara (Hydrochoerus hydrochoeris) parent carrying its baby on its back while swimming across a marsh. Parana, Southern Brazil.

Luiz Claudio Marigo / Capybara (Hydrochaeris hydrochaeris) adult with two juveniles. The Pantanal wetlands of Mato Grosso State, Brazil, November.

Luiz Claudio Marigo / Giant Cowbird (Molothrus oryzivorus) feeding on parasitic ticks from Capybaras (Hydrochaeris hydrochaeris). The Pantanal wetlands of Mato Grosso State, Brazil, October.

Luiz Claudio Marigo / Giant Cowbird (Molothrus oryzivorus) feeding on parasitic ticks from a Capybara (Hydrochoeris hydrochaeris). The Pantanal wetlands of Mato Grosso State, Brazil, October.

Pete Oxford / Capybara (Hydrochoerus hydrochaeris) swimming across the Rewa River, Iwokrama Reserve, Guyana

Mary McDonald / Cattle Tyrant (Machetornis rixosus) riding on the head of a Capybara (Hydrochoerus hydrochaeris) moving through swampland. The Tyrant flycatcher is hunting for insects disturbed by the rodent. Pantana...

Mary McDonald / Capybara (Hydrochoerus hydrochaeris) juvenile walking with mother, in shallow water, in the jungle of the Pantanal, Brazil.

Nick Garbutt / Tame wild Capybara (Hydrochoerus hydrochaeris) with tourists watching, Araras Lodge, Northern Pantanal, Brazil. September 2010

Nick Garbutt / Capybara (Hydrochoerus hydrochaeris) family group, wading along the Pixiam River, Northern Pantanal, Brazil. September

Christophe Courteau / Capybara (Hydrochoerus hydrochaeris) adult with young, Pantanal, Brazil, July

Christophe Courteau / Capybara (Hydrochoerus hydrochaeris) in water, Cabiai, Pantanal, Brazil, July

Christophe Courteau / Capybara (Hydrochoerus hydrochaeris) swimming across Cabiai river, Pantanal, Brazil, July

Piper Mackay / Capybara (Hydrochoerus hydrochaeris) resting, Pantanal, Brazil

Piper Mackay / Capybara (Hydrochoerus hydrochaeris) group of Capybara crossing Transpantaneria highway, Pantanal, Brazil

Piper Mackay / Capybara (Hydrochoerus hydrochaeris) suckling two babies, Pantanal, Brazil.

Piper Mackay / Capybara (Hydrochoerus hydrochaeris) suckling two babies, Pantanal, Brazil.

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) showing incisor teeth as it yawns, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) lying down on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) wallowing in pool of water on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) wallowing in pool of water on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) juvenile on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) wallowing in water with another behind, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) swimming, head above water, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) wallowing in pool of water on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) juvenile grazing on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Capybara (Hydrochoerus hydrochaeris) juvenile on marsh, Esteros del Ibera, Argentina

Fabio Liverani / Capybara {Hydrochaeris hydrochaeris} Tambopata National reserve, Amazonia, Peru

Pete Oxford / Group of Capybara {Hydrochoerus hydrochaeris} on river bank, Pantanal, Brazil

TIM MARTIN / Capybara {Hydrochoerus hydrochaeris} head amongst vegetation, El Cedral, Venezuelan Ilanos, Venezuela, South America

Pete Oxford / Capybara with plant on face {Hydrochoerus hydrochaeris} Pantanal, Brazil, South America

Hermann Brehm / Capybara baby {Hydrochoerus hydrochaeris} Llanos del Orinoco, Venezuela

LYNN M. STONE / Capybara {Hydrochoerus hydrochaeris} profile, captive

Doug Wechsler / Capybara {Hydrochoerus hydrochaeris} family group, Philadelphia, USA

Pete Oxford / Capybara {Hydrochoerus hydrochaeris} Pantanal, Brazil

Pete Oxford / Capybara {Hydrochoerus hydrochaeris} Pantanal, Brazil

Hermann Brehm / Capybara mating in water {Hydrochoerus hydrochaeris} Llanos del Orinoco, Venezuela

Pete Oxford / Capybara {Hydrochoerus hydrochaeris} Pantanal, Brazil

Hermann Brehm / Capybara {Hydrochoerus hydrochaeris} Llanos del Orinoco, Venezuela

Pete Oxford / Capybara {Hydrochoerus hydrochaeris} mating in water, Pantanal, Brazil

John Waters / Capybara {Hydrochoerus hydrochaeris} female with young, Ibera marshes, Argentina

Pete Oxford / Capybara {Hydrochaeris hydrochaeris} and Jacare caiman {Caiman crocodilus yacare} on water's edge, Pantanal, Brazil

Pete Oxford / Capybara feeding in wetlands {Hydrochoerus hydrochaeris} Pantanal, Brazil

Gabriel Rojo / Capybara family {Hydrochoerus hydrochaeris} Ibera marshes NR, Argentina

Pete Oxford / Head portrait of Capybara in water {Hydrochoerus hydrochaeris} Pantanal, Brazil, South America

Luiz Claudio Marigo / Capybara suckling young {Hydrochoerus hydrochaeris} Llanos, Venezuela

Luiz Claudio Marigo / Capybara suckling young {Hydrochoerus hydrochaeris} Llanos, Venezuela

Luiz Claudio Marigo / Capybara suckling young {Hydrochoerus hydrochaeris} Llanos, Venezuela

John Waters / Close up of young Capybara {Hydrochoerus hydrochaeris} suckling, Argentina

Gabriel Rojo / Capybaras (Hydrochoerus hydrochaeris) pair with six infants, resting on sandy beach at edge of river, Cuiaba River, Pantanal, Mato Grosso, Brazil.