Hougaard Malan / Acacia tree amongst flowering Tribulus on Kalahari Dune. Kgalagadi Transfrontier Park, Southern Africa. January 2010.
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Tony Heald / Eland (Taurotragus oryx) males locking horns and fighting. Devil's Thorn flowers (Tribulus terrestris) cover the ground. Etosha National Park, Namibia, January.
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Tony Heald / Eland (Taurotragus oryx) male horning the ground which is covered in Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Tony Heald / Spotted Hyaena (Crocuta crocuta) rolling in Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Sharon Heald / Black-faced Impala (Aepyceros melamis petersi) male standing in a field of Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Tony Heald / Zebra (Equus quagga) foal running through Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Philippe Clement / Devil's thorn (Tribulus zeyheri) the Kalahari desert's prominent creeper, appearing after the rains, Kgalagadi NP, South Africa
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Tui De Roy / Waved Albatross (Phoebastria irrorata) pair bonding in flowering tribulus field during rains, Punta Cevallos, Espanola Island, Galapagos Islands, Ecuador
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Constantinos Petrinos / Caltrop murex (Murex Tribulus) laying their egg masses on muddy seafloor of the Lembeh Lembeh Strait, North Sulawesi, Indonesia.
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Jen Guyton / Yellow devil's thorn flower (Tribulus zeyheri) in the Kalahari Desert, South Africa
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Jen Guyton / Meerkat (Suricata suricatta) standing among a field of Devil's thorn flowers (Tribulus zeyheri) in the Kalahari Desert, South Africa.
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Jen Guyton / Meerkats (Suricata suricatta) two look out over a field of Devil's thorn flowers (Tribulus zeyheri) in the Kalahari Desert, South Africa.
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Jen Guyton / Meerkats (Suricata suricatta) four looking out over a field of Devil's thorn flowers (Tribulus zeyheri) Kalahari Desert, South Africa.
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Jen Guyton / Meerkat pup (Suricata suricatta) standing among its family in a field of Devilthorn flowers (Tribulus zeyheri). Kalahari Desert, South Africa.
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Jen Guyton / African monarch butterfly (Danaus chrysippus) sipping nectar from a Devil's thorn flower (Tribulus zeyheri) in the Kalahari Desert, South Africa.
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Tony Heald / Egyptian goose (Alopochen aegyptiaca) pair amongst Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia, March.
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Tony Heald / White-backed vulture (Gyps africanus) sunbathing amongst Devil's-thorn yellow flowers (Tribulus terrestris), Etosha National Park, Namibia, March.
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Tony Heald / Klein Okevi waterhole covered by Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia, March 2016
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Tony Heald / Black-faced impala (Aepyceros melampus petersi) young male Lying in Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park Namibia, March.
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Tony Heald / Black-faced impala (Aepyceros melampus petersi) female leaping above Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia.
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Tony Heald / Lion (Panthera leo) male, walking amongst Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia.
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Richard Du Toit / Dubbeltjie flowers (Tribulus terrestris) with Lion (Panthera leo). Kgalagadi Transfrontier Park, South Africa, February.
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Neil Aldridge / White stork (Ciconia ciconia) in grassland, Mapungubwe National Park, South Africa.
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Ann & Steve Toon / Ground squirrel (Xerus inauris) feeding in Devil's thorn flowers (Tribulus terrestris) Kgalagadi Transfrontier Park, Northern Cape, South Africa. Non-ex.
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Ann & Steve Toon / Ground squirrel (Xerus inauris) eating devil's thorn flowers (Tribulus zeyheri), Kgalagadi Transfrontier Park, Northern Cape, South Africa, February
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Richard Du Toit / Lion (Panthera leo) in Dubbeltjie flower (Tribulus terrestris) Northern Cape Province, South Africa, February.
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Albert Lleal / Yellow Vine (Tribulus terrestris) seed covered in sharp spines that enable dispersal, magnification 23x
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Richard Du Toit / Red Hartebeest (Alcelaphus caama) feeding on grasses near Yellow Vine (Tribulus terrestris) flowers, Kgalagadi Transfrontier Park, Botswana
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Richard Du Toit / Ostrich (Struthio camelus) male in Yellow Vine (Tribulus terrestris) flowers, Kgalagadi Transfrontier Park, Botswana
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Tony Heald / RF- Zebra (Equus quagga) foal in profile standing in Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January. (This image may be licensed either as rights managed or royalt...
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Tony Heald / Black-backed Jackal (Canis mesomelas) stalking through Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Sharon Heald / White Rhinoceros (Ceratotherium simum) walking through Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Tony Heald / Crowned Plover (Vanellus coronatus) stood among Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Sharon Heald / Greater kudu (Tragelaphus strepsiceros) male walking through Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Tony Heald / Black-faced Impala (Aepyceros melamis petersi) male jumping ("stotting" or "pronking") to demonstrate fitness to potential mates, competitors and predators. Devil's Thorn fl (Tribulus terrestris) in f...
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Tony Heald / Pin-Tailed Whydah (Vidua macroura) male in breeding plumage. Devil's Thorn flowers (Tribulus terrestris) cover the ground. Etosha National Park, Namibia, January.
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Hanne & Jens Eriksen / Caltrop (Tribulus omanense) bush in flower, Liwa, Abu Dhabi, United Arab Emirates.
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Hanne & Jens Eriksen / Caltrop (Tribulus omanense). Liwa, Abu Dhabi, United Arab Emirates.
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Jouan & Rius / Devil thorn flowers (Tribulus terrestris) after the rains, Kgalagadi Transfrontier Park, Kalahari desert, South Africa
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Jouan & Rius / Carpet of Devil thorn flowers (Tribulus terrestris) and other flowers during the rainy season, Namaqualand, South Africa
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Jouan & Rius / Carpet of Devil thorn flowers (Tribulus terrestris) and other flowers during the rainy season, Namaqualand, South Africa
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Martin Gabriel / Spitzkoppe, Namibia, with Devil's thorn {Tribulus sp} flowering in the foreground in the wet season
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Richard Du Toit / Yellow Vine (Tribulus terrestris), Kgalagadi Transfrontier Park, South Africa
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Philippe Clement / Devil's claw (Harpagophytum procumbens) and Devil's thorn (Tribulus zeyheri), prominent creepers of the Kalahari Desert that appear after the rains, Kgalagadi Transfrontier Park, South Africa
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Philippe Clement / Devil's claw (Harpagophytum procumbens) and Devil's thorn (Tribulus zeyheri), prominent creepers of the Kalahari Desert that appear after the rains, Kgalagadi Transfrontier Park, South Africa
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Pete Oxford / Devil's thorn in flower {Tribulus terrestris} Sossusvlei, Namib desert, Namibia
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Richard Du Toit / Kori bustard {Choriotis kori} amongst Little devil flowers {Tribulus terrestris} Kalahari Gemsbok NP, South Africa
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Tui De Roy / Waved Albatross (Phoebastria irrorata) pair bonding in flowering tribulus field during rains, Punta Cevallos, Espanola Island, Galapagos Islands, Ecuador
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Richard Du Toit / Suricate (meerkat) {Suricata suricatta} on guard in flowering 'little devils' {Tribulus terrestris}. S Africa Kalahari >>> Gemsbok NP
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Pete Oxford / Devil's thorn in flower {Tribulus terrestris} Clay castles, Skeleton coast, Namibia
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Pete Oxford / Desert in bloom. Devil thorn flowers {Tribulus terrestris} Kgalagadi TP, (formerely Kalahari Gemsbok) South Africa
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Richard Du Toit / Suricate (meerkat) {Suricata suricatta} on guard in flowering 'little devils' {Tribulus terrestris}. S Africa Kalahari >>> Gemsbok NP
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Richard Du Toit / Black backed jackal, with Flowering devils flowers {Tribulus terrestris} Kruger National Park, S. Africa
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Richard Du Toit / Little devil flowers (Tribulus terrestris) and acacia Grey camelthorn trees, S Africa Kalahari Gemsbok NP in summer.
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Richard Du Toit / Striped Ground Squirrel (Xerus erythropus) feeding. South Africa. Kalahari Gemsbok NP summer. Little Devil Flowers (Tribulus terrestris)
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Pete Oxford / Devil thorn bush {Tribulus terrestris} flowering in sand Skeleton coast, Namibia
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Pete Oxford / Devil thorn bush {Tribulus terrestris} in flower with seal bones in sand nearby, Skeleton coast, Namibia
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Richard Du Toit / African Lion (Panthera leo) female lying in Yellow Vine (Tribulus terrestris) flowers, Kgalagadi Transfrontier Park, South Africa
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Richard Du Toit / Cape Ground Squirrel (Xerus inauris) feeding on Yellow Vine (Tribulus terrestris) flowers, Kgalagadi Transfrontier Park, Botswana
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Richard Du Toit / Gemsbok (Oryx gazella) and Yellow Vine (Tribulus terrestris) flowers, Kgalagadi Transfrontier Park, Botswana
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Richard Du Toit / African Lion (Panthera leo) male standing in Yellow Vine (Tribulus terrestris) flowers, Kgalagadi Transfrontier Park, South Africa
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Pete Oxford / Devil thorn bush {Tribulus terrestris} flowering in sand Skeleton coast, Namibia
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Ann & Steve Toon / Female Cheetah (Acinonyx jubatus) with two juveniles, sitting among Devil's thorn (Tribulus terrestris) wildlfowers, Kgalagadi Transfrontier Park, Northern Cape, South Africa.
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Ann & Steve Toon / Female Cheetah (Acinonyx jubatus) lying down among Devil's thorn (Tribulus terrestris) flowers, Kgalagadi Transfrontier Park, Northern Cape, South Africa.
