Alex Mustard / A diver explores Silfra Canyon, a deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this phot...
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Bernard Castelein / Coquerel's sifaka (Propithecus coquereli) in tree, relaxing, Ankarafantsika National Park, Madagascar
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Mary McDonald / Adult Mountain gorilla (Gorilla beringei beringei) holding baby, Hirwa group, Volcanoes National Park, Rwanda
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Christophe Courteau / Mountain gorilla (Gorilla beringei beringei), silverback and juvenile son. Volcanoes National Park. Rwanda.
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Christophe Courteau / Mountain gorilla (Gorilla beringei beringei), dominant silverback in forest clearing. Volcanoes National Park, Rwanda.
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Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) blackback, juvenile male demonstrating power. Volcanoes National Park, Rwanda.
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Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) blackback, juvenile male demonstrating power. Volcanoes National Park, Rwanda.
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Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) female with baby, portrait. Volcanoes National Park, Rwanda.
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Christophe Courteau / Mountain gorilla (Gorilla gorilla beringei) playing, rolling down a slope, part of the Amahoro Gorilla Group, Volcanoes National Park, Rwanda.
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Christophe Courteau / Mountain gorilla (Gorilla gorilla beringei) feeding, part of the Agashya Gorilla Group, Volcanoes National Park, Rwanda.
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Christophe Courteau / Family of Mountain gorillas (Gorilla gorilla beringei) with a silverback, grooming and looking around, part of the HIrwa Gorilla Group, Volcanoes National Park, Rwanda.
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Ingo Arndt / Rainforest slope Mount Bisoke (3711m), Mountain gorilla habitat (Gorilla gorilla beringei), Parc National des Volcans, Rwanda
