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
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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 / 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 / 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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Luciano Candisani / Water Lettuce (Pistia stratiotes) in Tapajos River, Amazon, Brazil
