Ingo Arndt / African Jacana (Actophilornis africana) foraging near Hippopotamus (Hippopotamus amphibius) amid water lettuce, Masai Mara National Reserve, Kenya
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Gerry Ellis / Hippopotamus (Hippopotamus amphibius) swimming in water lettuce, with Cattle Egret (Bulbulcus ibis) perched on head, Serengeti National Park, Tanzania
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Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) emerging from a river full of water lettuce, Botswana
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Tony Heald / RF- Hippopotamus (Hippopotamus amphibius) surrounded by water lettuce. Kruger National Park, South Africa. (This image may be licensed either as rights managed or royalty free.)
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Winfried Wisniewski / Hippopotamus (Hippopotamus amphibius) in water lettuce, Masai Mara, Kenya
Anup Shah / Bonobo (Pan paniscus) mature male 'Manono' aged 17 years resting in water, stripping bark off a branch, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Anup Shah / Bonobo (Pan paniscus) male 'Kikwit' wading through lake amongst water lettuce plants, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Anup Shah / Bonobo (Pan paniscus) male 'Kikwit' wading through deep water amongst water lettuce plants, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Anup Shah / Bonobo (Pan paniscus) adolescent male wading through water to find food, amongst water lettuce, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Anup Shah / Bonobo (Pan paniscus) mature male 'Fizi' wading through water to find food amongst water lettuce, reaching out, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Anup Shah / Bonobo (Pan paniscus) mature male 'Manono' wading through lake with water lettuce, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Anup Shah / Bonobo (Pan paniscus) mature male 'Fizi' standing at the edge of a lake, amongst water lettuce, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Anup Shah / Bonobo (Pan paniscus) mature male 'Manono' wading through deep water amongst water lettuce searching for food, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.
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Pete Oxford / Brown Caiman (Caiman crocodilus fuscus) with water lettuce (Pistia stratiotes) on its back. Hato Masaguarel working farm and biological station, Guarico Province, Venezuela, March.
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Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) with water lettuce on its back, on sandy river bank. Captive female for breeding to release young into the wild. Guarico Province, Venezuela.
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Pete Oxford / Brown Caiman (Caiman crocodilus fuscus) - subspecies of Caiman crocodilus - in front of water covered with Water Lettuce (Pistia stratiotes). Guarico Province, Venezuela.
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Pete Oxford / Spectacled Caiman (Caiman crocodilus), Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Spectacled Caiman (Caiman crocodilus), Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Savanna Side-necked Turtle (Podocnemis vogli) pair basking, Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Savanna Side-necked Turtle (Podocnemis vogli) basking, Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Savanna Side-necked Turtle (Podocnemis vogli) pair basking, Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Savanna Side-necked Turtle (Podocnemis vogli) head looking above water surface, Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Spectacled Caiman (Caiman crocodilus) in Water Lettuce (Pistia stratiotes), Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Spectacled Caiman (Caiman crocodilus) in Water Lettuce (Pistia stratiotes), Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Spectacled Caiman (Caiman crocodilus), Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Spectacled Caiman (Caiman crocodilus) feeding on Capybara (Hydrochoerus hydrochaeris), Hato Masaguaral working farm and biological station, Venezuela
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Pete Oxford / Savanna Side-necked Turtle (Podocnemis vogli) sunbathing, Hato Masaguaral working farm and biological station, Venezuela
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Rolf Nussbaumer / Sora Rail (Porzana carolina) juvenile walking on Water Lettuce, Refugio, Coastal Bend, Texas Coast, USA
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Rolf Nussbaumer / Least Bittern (Ixobrychus exilis) adult walking on Water Lettuce, Fennessey Ranch, Refugio, Coastal Bend, Texas Coast, USA
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Rolf Nussbaumer / American Alligator (Alligator mississippiensis) with head partially submerged, amongst Water Lettuce (Pistia stratiotes) Fennessey Ranch, Refugio, Coastal Bend, Texas Coast, USA
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Martin Gabriel / Water cabbage / lettuce (Pistia stratiotes) floating on a river near Sierpe, Southern Costa Rica, February 2009
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Martin Gabriel / Water cabbage / lettuce (Pistia stratiotes) floating on a river near Sierpe, Southern Costa Rica
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Kevin Schafer / Hippopotamus (Hippopotamus amphibius) amid water lettuce, Masai Mara, Kenya
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Gerry Ellis / Hippopotamus (Hippopotamus amphibius) mother and young in water lettuce are surrounded by Cattle Egrets (Bulbulcus ibis), Serengeti National Park, Tanzania
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Luciano Candisani / Water Lettuce (Pistia stratiotes) in Tapajos River, Amazon, Brazil
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Rolf Nussbaumer / Limpkin (Aramus guarauna) standing on Water Lettuce, Corkscrew Swamp Sanctuary, Florida, USA. December 1998
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Tony Heald / Green-backed heron / Striated green heron {Butorides striatus} on water lettuce Kruger NP, South Africa.
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Tony Heald / Green-backed heron / Striated green heron {Butorides striatus} on water lettuce, Kruger NP, South Africa.
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Gerry Ellis / Hippopotamus (Hippopotamus amphibius) mother and baby emerging from water lettuce in river, Serengeti National Park, Tanzania
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Gerry Ellis / Hippopotamus (Hippopotamus amphibius) pair swimming in water lettuce, Serengeti National Park, Tanzania
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Rolf Nussbaumer / Little blue heron {Egretta caerulea} on water lettuce, Florida, USA
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Roberto Rinaldi / Coral reef with deep water sea fans, tube sponges and in the foreground a colony of lettuce coral, Honduras.
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Tony Heald / Saddlebill stork {Ephippiorhynchus senegalensis} amongst in water lettuce, Kruger NP, S Africa
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Thomas Mangelsen / Little Blue Heron (Egretta caerulea) foraging among water lettuce, Everglades National Park, Florida
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Tony Heald / Saddlebill stork wading amongst water lettuce {Ephippiorhynchus senegalensis} Kruger NP S Africa
