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.
