Gavin Hellier / Iguacu Falls, Foz do Igua?u, Iguacu (Iguazu) National Park, Brazil, South AmericaSeptember 2016. Hellier
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Ingo Arndt / Sunrise at Iguacu Falls, largest waterfalls in the world, Iguacu National Park, Brazil
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Nick Garbutt,Nick Garbutt / Tourist watching masses of butterflies drinking from temporary pools. Various species including Large Orange Sulphur (Phoebis agarithe), Cloudless Sulphur (Phoebis sennae), White-angled Sulphur (Anteo...
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Nick Garbutt / Iguasu Falls by moonlight, on the Iguasu River, Brazil / Argentina border. Photographed from the Brazilian side of the Falls. State of Parana, Brazil.
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Thomas Marent / Cascades of the Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Argentina
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Thomas Marent / Two Sisters Waterfalls, Iguacu Falls National Park, Brazil
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Thomas Mangelsen / Cascades of Iguacu Falls surrounded by tropical rainforest, Iguacu Falls National Park, Brazil
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Konrad Wothe / Rainbow at Iguacu Falls, largest waterfalls in the world, Iguacu National Park, Brazil
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Luke Massey / Great dusky swifts (Cypseloides senex) roosting behind one of the falls at Iguassu Falls, Brazil
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Luke Massey / Great dusky swifts (Cypseloides senex) roosting behind one of the falls at Iguassu Falls, Brazil
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Michel Roggo / Iguazu Falls, Iguacu National Park, Brazil, Argentina November 2016 . Photographed for The Freshwater Project
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Michel Roggo / Iguazu Falls, Iguacu National Park, Brazil, Argentina November 2016 . Photographed for The Freshwater Project
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Michel Roggo / Iguazu Falls, Iguacu National Park, Brazil, Argentina November 2016 . Photographed for The Freshwater Project
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Michel Roggo / Iguazu Falls, Iguacu National Park, Brazil, Argentina November 2016 . Photographed for The Freshwater Project
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Michel Roggo / Iguazu Falls, Iguacu National Park, Brazil, Argentina November 2016 . Photographed for The Freshwater Project
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Turkey vultures (Cathartes aura) in tree in front of Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Waterfall, Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls at sunset, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Waterfalls and tourists on viewing platform, Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Landscape of Iguazu Falls in mist, with tourists on viewing platform, Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Landscape of Iguazu Falls in mist, with tourists on viewing platform, Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguazu Falls, Iguazu National Park, Argentina January 2014.
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Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguazu Falls, Iguazu National Park, Argentina, January 2014.
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Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguazu Falls, Iguazu National Park, Argentina, January 2014.
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Ingo Arndt / Iguazu Falls at sunset, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu falls with rainbow, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu falls with rainbow, Iguazu National Park, Brazil, January 2014.
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Ingo Arndt / Iguazu Falls, Iguazu National Park, Brazil, January 2014.
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Angelo Gandolfi / Salto Escondido, Iguazu falls, Brazil/Argentina, from the Argentine side. September 2010.
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Angelo Gandolfi / Boat of tourists under the waterfalls of Garganta del Diablo (Devil's Throat), Iguazu falls, Brazil/Argentina, from the Brazilian side. September 2010.
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Angelo Gandolfi / Black vultures (Coragyps atratus) in flight over Iguazu falls, Brazil/Argentina, from the Brazilian side. September 2010.
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Angelo Gandolfi / Black vultures (Coragyps atratus) in flight over Iguazu falls, Brazil/Argentina, from the Brazilian side. September 2010.
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Angelo Gandolfi / Black vulture (Coragyps atratus) in flight in front of Salto Mosqueteros waterfall, Iguazu falls, Brazil/Argentina, from the Brazilian side. September 2010.
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Angelo Gandolfi / Black vultures (Coragyps atratus) in flight in front of Salto Santa Maria waterfall, Garganta del Diablo (Devil's Throat), Iguazu falls, Brazil/Argentina. September 2010.
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Angelo Gandolfi / Great dusky swift (Cypseloides senex) flock in front of Iguazu falls, Brazil/Argentina, from the Brazilian side. September.
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Angelo Gandolfi / Salto Rivadavia, Iguazu falls, Brazil/Argentina. September 2010.
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Angelo Gandolfi / Salto Escondido waterfalls. Iguazu falls, Brazil/Argentina, from the Argentine side. September 2010.
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Angelo Gandolfi / Salto Escondido waterfalls. Iguazu falls, Brazil/Argentina, from the Argentine side. September 2010.
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Angelo Gandolfi / Salto Escondido waterfalls. Iguazu falls, Brazil/Argentina, from the Argentine side. September 2010.
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Angelo Gandolfi / Boat and rainbow under the waterfalls of Salto San Martin. Iguazu falls, Brazil/Argentina, from the Argentine side. September 2010.
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Angelo Gandolfi / The Salto Union at Garganta del Diablo (Devil's Throat), Iguazu falls, Brazil/Argentina, from the Argentine side. September 2010.
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Angelo Gandolfi / Entrance to Iguazu Falls National Park, Brazil, September 2010.
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Angelo Gandolfi / South American coatis (Nasua nasua) searching for food at tourist site. Iguazu falls, Brazil/Argentina.
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Angelo Gandolfi / South American coati (Nasua nasua), searching for food amongst tourists. Iguazu falls, Brazil/Argentina.
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Ingo Arndt / Tourists on viewing platform, Iguacu Falls, Iguacu National Park, Brazil
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Ingo Arndt / Great Dusky Swift (Cypseloides senex) group perched on cliff near waterfall, Iguacu National Park, Brazil
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Luiz Claudio Marigo / Iguassu Falls at Iguacu National Park, Foz do Iguacu, Parana State, Southern Brazil, April 2013.
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Luiz Claudio Marigo / Iguassu Falls at Iguacu National Park, Foz do Iguacu, Parana State, Southern Brazil, April 2013.
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Luiz Claudio Marigo / Iguassu Falls at Iguacu National Park, Foz do Iguacu, Parana State, Southern Brazil.
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Luiz Claudio Marigo / Tourists on bridge observing Iguasu Falls, Iguasu National Park, Brazil, April 2013.
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Ingo Arndt / Tourists on viewing platform, Iguacu Falls, Iguacu National Park, Brazil
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Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguacu Falls, Iguacu National Park, Argentina
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Ingo Arndt / Sunset at Iguacu Falls, largest waterfalls in the world, Iguacu National Park, Brazil
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Ingo Arndt / Rainbow over Iguacu Falls, largest waterfalls in the world, Iguacu National Park, Brazil
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Ingo Arndt / Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Brazil
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Ingo Arndt / Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Brazil
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Ingo Arndt / Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Brazil
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Ingo Arndt / Sunset at Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Brazil
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Ingo Arndt / Cascades of the Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Argentina
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Ingo Arndt / Iguacu Falls cascading in rainforest, Iguacu Falls National Park, Brazil
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Hiroya Minakuchi / Devil's Throat, Iguacu Falls, Iguacu National Park, Argentina
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Hiroya Minakuchi / Iguacu Falls, Iguacu National Park, Brazil
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Hiroya Minakuchi / Iguacu Falls, Iguacu National Park, Argentina
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Hiroya Minakuchi / Devil's Throat, Iguacu Falls, Iguacu National Park, Argentina
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Hiroya Minakuchi / Devil's Throat, Iguacu Falls, Iguacu National Park, Argentina
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Hiroya Minakuchi / Devil's Throat, Iguacu Falls, Iguacu National Park, Argentina
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Nick Garbutt / RF- Rainbow over Iguasu Falls, on the Iguasu River, Brazil / Argentina border, from the Brazilian side. State of Parana, Brazil. September 2012. (This image may be licensed either as rights managed or...
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Konrad Wothe / Cascades of the Iguacu Falls, the world's largest waterfalls, Iguacu National Park, border of Brazil and Argentina
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Konrad Wothe / Cascades of the Iguacu Falls, the world's largest waterfalls, with rainbow, Iguacu National Park, border of Brazil and Argentina
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Konrad Wothe / Cascades of the Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Brazil
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Michael Hutchinson / Iguazu Falls and tourist pleasure boat, Iguacu National Park, Argentina February 2009
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Michael Hutchinson / Tourists on viewing platform dwarfed by Iguazu falls including Garganta del Diablo (Devil's throat), Iguacu National Park, Argentina February 2009
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Michael Hutchinson / People on viewing platform dwarfed by Iguazu falls, Iguacu National Park, Argentina February 2009
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Michael Hutchinson / View down over the Iguazu falls with tourist walkway visible, Iguacu National Park, Argentina February 2009
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Michael Hutchinson / Iguazu Falls with rainbow, Iguaçu National Park, Brazil
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Michael Hutchinson / Iguazu falls, Iguaçu National Park, Brazil
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Michael Hutchinson / Iguazu Falls with rainbow, Iguaçu National Park, Brazil February 2009
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Kevin Schafer / Slaty-breasted Wood-Rail (Aramides saracura) in rainforest understory, Iguacu National Park, Brazil
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Kevin Schafer / Dusky-legged Guan (Penelope obscura) perching, Iguacu National Park, Brazil
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Kevin Schafer / Plush-crested Jay (Cyanocorax chrysops), Iguacu National Park, Brazil
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Thomas Marent / Cascades of the Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Argentina
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Thomas Marent / Red-breasted Toucan (Ramphastos dicolorus) on branch, Iguacu Falls National Park, Brazil
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Thomas Marent / Red-breasted Toucan (Ramphastos dicolorus) on branch, Iguacu Falls National Park, Brazil
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Thomas Marent / Cascades of Iguacu Falls, Iguacu Falls National Park, Brazil
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Thomas Marent / Nymphalid butterfly (Temenis laothoe), Iguacu National Park, Brazil
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Theo Allofs / Cascades of Iguacu Falls, Iguacu Falls National Park, Brazil
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Theo Allofs / Cascades of Iguacu Falls, Iguacu Falls National Park, Brazil
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Konrad Wothe / Aerial view of Iguacu Falls, largest waterfalls in the world, Iguacu National Park, Brazil