Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) group and Galapagos Hawk (Buteo galapagoensis) on rim of cloud filled caldera at sunrise, Alcedo Volcano, Isabella Island, Galapagos Islan...
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Tim Fitzharris / Indian Paintbrush (Castilleja miniata) surrounded by pine cones, South Rim, Grand Canyon National Park, Arizona
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Gavin Hellier / People viewing Grand Canyon landscape from the South Rim, Grand Canyon NP, Arizona, USA
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Gavin Hellier / Grand Canyon landscape from the South Rim, Grand Canyon NP, Arizona, USA
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Gavin Hellier / Grand Canyon landscape from the South Rim, Grand Canyon NP, Arizona, USA
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Gavin Hellier / Panoramic view of South Rim with clearing winter storm, Grand Canyon NP, Arizona, USA
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Gavin Hellier / Panoramic view of South Rim of the Grand Canyon, Grand Canyon NP, Arizona, USA
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Paul D Stewart / Illustration of 'Albemarle Island' (now Isabela) engraving by Huyot and Bepard facing page 520 in 'All Around the World' published in 1872 by William Collins & Son. Shows the large caldera of a volcan...
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Paul D Stewart / Illustration of 'Albemarle Island' (now Isabela) hand coloured engraving by Huyot and Bepard facing page 520 in 'All Around the World' published in 1872 by William Collins & Son. Shows the large calde...
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Gerry Ellis / View from south rim along western wall of Ngorongoro Crater, Tanzania
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Tim Fitzharris / Grand Canyon, South Rim, Arizona
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Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) amid steaming fumaroles, caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador
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Tui De Roy / Galapagos Hawk (Buteo galapagoensis) overlooking 1000 meter caldera, Fernandina Island, Galapagos Islands, Ecuador
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Tui De Roy / Galapagos Land Iguana (Conolophus subcristatus) gravid female searching for descent along fractured caldera rim, Fernandina Island, Galapagos Islands, Ecuador
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Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) amid steaming fumaroles on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador
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Flip Nicklin / South end of Long Beach and stormy surf, Clayoquot Sound, Vancouver Island, British Columbia, Canada
