Michael Hutchinson / Cururu / Roccoco toad (Bufo paracnemis), largest amphibian in Argentina, Esteros del Ibera, Argentina, November

Gabriel Rojo / Flambeau butterfly on flower {Dryas iulia} Ibera marshes, Argentina

Gabriel Rojo / Wattled jacana {Jacana jacana} Ibera marshes, Argentina

Sebastian Kennerknecht / Jacare Caiman (Caiman yacare), Ibera Provincial Reserve, Ibera Wetlands, Argentina

Sebastian Kennerknecht / Capybara (Hydrochoerus hydrochaeris) male grazing in marsh near storm, Ibera Provincial Reserve, Ibera Wetlands, Argentina

Sebastian Kennerknecht / Geoffroy's Cat (Leopardus geoffroyi), habituated female, Ibera Provincial Reserve, Ibera Wetlands, Argentina

Sebastian Kennerknecht / Rufescent Tiger-Heron (Tigrisoma lineatum) juvenile, Ibera Provincial Reserve, Ibera Wetlands, Argentina

Sebastian Kennerknecht / Geoffroy's Cat (Leopardus geoffroyi), habituated female, Ibera Provincial Reserve, Ibera Wetlands, Argentina

Sebastian Kennerknecht / Capybara (Hydrochoerus hydrochaeris) juvenile smelling mother, Ibera Provincial Reserve, Ibera Wetlands, Argentina

Sebastian Kennerknecht / Capybara (Hydrochoerus hydrochaeris) father with juveniles, Ibera Provincial Reserve, Ibera Wetlands, Argentina

Sebastian Kennerknecht / Giant Wood-Rail (Aramides ypecaha), Ibera Provincial Reserve, Ibera Wetlands, Argentina

Nate Chappell/ BIA / Yellow Armadillo (Euphractus sexcinctus) at burrow, Ibera Provincial Reserve, Argentina

Ben Hall / Roseate spoonbill (Platalea ajaja) in flight over lake at dusk, Ibera wetlands / Esteros Del Ibera, Argentina

Ben Lascelles / Yacare Caiman (Caiman yacare). Esteros del Ibera, Corrientes, Argentina. October

Ben Lascelles / Yellow Anaconda (Eunectes notaeus) injured individual taken into care. Esteros de Ibera, Providencia, Argentina, October

Ben Lascelles / Southern Screamer (Chauna torquata). In flight. Esteros de Ibera / Ibera Wetlands Provincial Park, Argentina. October

Ben Lascelles / Southern Screamer (Chauna torquata). In flight, 'screaming'. Esteros de Ibera / Ibera Wetlands Provincial Park, Argentina. October

Ben Lascelles / Southern Screamer (Chauna torquata) in flight. Esteros de Ibera / Ibera Wetlands Provincial Park, Argentina. October

Ben Lascelles / Maguari Stork (Ciconia maguari) adult in flight. Ibera Wetlands Provincial Park, Argentina. October

Ben Lascelles / Maguari Stork (Ciconia maguari) adult in flight. Ibera Wetlands Provincial Park, Argentina, October

Ben Lascelles / Maguari Stork (Ciconia maguari), adult in flight, Ibera Wetlands Provincial Park, Argentina, October

Ben Lascelles / Jabiru Stork (Jabiru mycteria) adult in flight, Ibera wetland Provincial Park, Argentina. October

Ben Lascelles / Ibera Wetlands Provincial Park, Corrientes Province, Argentina. October 2008

Ben Lascelles / Ibera Wetlands Provincial Park, Corrientes Province, Argentina. October 2008

Ben Lascelles / Green-barred Woodpecker (Colaptes melanochloros). Perched on fence post with Chestnut-capped Blackbird (Chrysomus ruficapillus) in background. Esteros de Ibera/Ibera Wetlands Provincial Park, Argentin...

Ben Lascelles / Capybara (Hydrochoerus hydrochaeris). Esteros del Ibera / Ibera Wetlands Provincial Nature Reserve, Corrientes, Argentina, October

Ben Lascelles / Capybara (Hydrochoerus hydrochaeris). Esteros del Ibera / Ibera Wetlands Provincial Nature Reserve, Corrientes, Argentina, October

Ben Lascelles / Black-capped Donacobius (Donacobius atricapilla). Ibera Wetlands Provincial Park. Argentina, October

Ben Lascelles / Black-capped Donacobius (Donacobius atricapilla). Esteros del Ibera / Ibera Wetlands Provincial Park. Argentina, October

Ben Lascelles / Sunset over Ibera Wetlands Provincial Park, Corrientes Province, Argentina. October 2008.

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

Ben Lascelles / Capybara (Hydrochoerus hydrochaeris). Ibera Wetlands Provincial Nature Reserve, Corrientes, Argentina, October.

Ben Lascelles / Yacare Caiman (Caiman yacare) skin and limb-joint close up. Ibera wetlands, Corrientes, Argentina, October.

Ben Lascelles / Jabiru Stork (Jabiru mycteria) in marsh habitat. Ibera wetland Provincial Park, Argentina, October.

Ben Lascelles / Yacare Caiman (Caiman yacare) jaw and eye. Ibera Wetlands, Corrientes, Argentina, October.

Ben Lascelles / Southern / Crested Screamer (Chauna torquata) parental pair with chicks at nest. Ibera Wetlands Provincial Park, Argentina, October.

Michael Hutchinson / Whistling Heron (Syrigma sibilatrix) on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Rufescent Tiger-heron (Tigrisoma lineatum) with prey in beak on marshes, Esteros del Ibera, Argentina

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 / Southern / Crested screamer (Chauna torquata) calling in marshes, Esteros del Ibera, Argentina

Michael Hutchinson / Southern / Crested screamers (Chauna torquata) pair on marsh, Esteros del Ibera, Argentina

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

Michael Hutchinson / Spectacled caiman (Caiman crocodilus) in marsh habitat, Esteros del Ibera, Argentina

Michael Hutchinson / Lake and reeds, Esteros del Ibera, Argentina February 2009

Michael Hutchinson / Giant wood rail (Aramides ypecaha) foraging on marshes, Esteros del Ibera, Argentina

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

Michael Hutchinson / Spectacled caiman (Caiman crocodilus) with mouth open, Esteros del Ibera, Argentina

Michael Hutchinson / Cururu / Roccoco toad (Bufo paracnemis), largest amphibian in Argentina, Esteros del Ibera, Argentina

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

Michael Hutchinson / Marsh deer {Blastocerus dichotomus} feeding on marsh, Esteros del Ibera, Argentina, vulnerable species

Michael Hutchinson / Giant wood rail (Aramides ypecaha), Esteros del Ibera, Argentina

Michael Hutchinson / Water Hyacinth (Eichhornia crassipes) in flower in marsh, Esteros del Ibera, Argentina

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

Michael Hutchinson / Spectacled caiman (Caiman crocodilus) with mouth wide open, Esteros del Ibera, Argentina

Michael Hutchinson / Brazilian teal {Amazonetta brasiliensis} on marshes, Esteros del Ibera, Argentina

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

Michael Hutchinson / Marsh deer {Blastocerus dichotomus} on marsh, Esteros del Ibera, Argentina, vulnerable species

Michael Hutchinson / Whistling Heron (Syrigma sibilatrix) foraging on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Giant wood rail (Aramides ypecaha) foraging on marshes, Esteros del Ibera, Argentina

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

Michael Hutchinson / Spectacled caiman (Caiman crocodilus) on marshes, Esteros del Ibera, Argentina

Michael Hutchinson / Sunset over lake, Esteros del Ibera, Argentina

Michael Hutchinson / Giant wood rail (Aramides ypecaha) foraging on marshes, Esteros del Ibera, Argentina

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

Michael Hutchinson / Cururu / Roccoco toad (Bufo paracnemis), largest amphibian in Argentina, Esteros del Ibera, Argentina

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

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

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

Ross Couper-Johnston / Gaucho poling canoe Ibera Marshes National Reserve, North Argentina, South America

Ross Couper-Johnston / Great egret with piranha in beak {Ardea alba} Ibera marshes, North Argentina

Ross Couper-Johnston / Caiman submerged in lagoon. (Caiman sp) Ibera Marshes, Argentina

Ross Couper-Johnston / Yellow anaconda. (Eunectes notaeus) Argentina Ibera marshes NR

Ross Couper-Johnston / Argentine boa {Boa constrictor occidentalis} climbing tree, Argentina, Ibera marshes.

Ross Couper-Johnston / Black Howler Monkey (Alouatta caraya) Ibera Marshes Nature Reserve, Argentina

Ross Couper-Johnston / Bromeliad in flower, Ibera marshes National Reserve, N Argentina, South America

Gabriel Rojo / Rufescent tiger heron {Tigrisoma lineatum} Ibera marshes, Argentina

Gabriel Rojo / Three Jacare caiman {Caiman crocodilus yacare} Ibera marshes, Argentina

Ross Couper-Johnston / Gaucho poling canoe at sunset. Ibera Marshes National Reserve, Argentina, South America

Ross Couper-Johnston / Caiman with piranha at sunset. Ibera Marshes Nature Reserve, Argentina

Ross Couper-Johnston / Caiman coming out of lagoon at sunset. Argentina, Ibera Marshes Nature Reserve. South America

Daniel Gomez / Gaucho prepares to burn grassland. Land management. Ibera NR, Argentina, South America

Gabriel Rojo / Marsh deer (Blastocerus dichotomus) in Ibera marshes, Argentina, vulnerable species

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

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

Gabriel Rojo / White headed marsh tyrant {Arundinicola leucocephala} Ibera marshes, Argentina

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

Gabriel Rojo / Marsh deer {Blastocerus dichotomus} Ibera marshes, Argentina

Gabriel Rojo / White headed marsh tyrant {Arundinicola leucocephala} Ibera marshes, Argentina

Gabriel Rojo / Marsh deer (Blastocerus dichotomus) wading in Ibera marshes, Argentina, vulnerable species

Gabriel Rojo / Jacare caiman {Caiman crocodilus yacare} in Ibera Marshes, Argentina

Gabriel Rojo / Jacare caiman on Ibera marshes {Caiman crocodilus yacare} Argentina

Gabriel Rojo / Two baby Jacare caimen on Ibera marshes {Caiman crocodilus yacare} Argentina

Gabriel Rojo / Jacare caiman portrait {Caiman crocodilus yacare} Ibera marshes, Argentina

Gabriel Rojo / Jacare caiman on Ibera marshes {Caiman crocodilus yacare} Argentina

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