Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Turret Arch and the Milky Way, Arches National Park, Utah

Jeff Foott / Milky way over arch, Turret Arch, Arches National Park, Utah

Tim Fitzharris / Turret arch through north window arch, Arches National Park, Utah

David Welling / Rock arch in Colorado plateau. Arches NP, Utah, Turret Arch

Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Trail to Turret Arch, Arches National Park, Utah

Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Turret Arch and North Window Arch, Arches National Park, Utah

Jeff Foott / Full moon and Turret Arch, Windows Section, Arches National Park, Utah

Ingo Arndt / Turret Arch as seen through the North Window Arch, Arches National Park, Colorado Plateau, Utah, USA, September 2010

Jouan Rius / Turret Arch and North Window, Arches National Park, Utah, USA November 2012

Mary McDonald / Adult Mountain gorilla (Gorilla beringei beringei) holding baby, Hirwa group, Volcanoes National Park, Rwanda

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.

Christophe Courteau / Silverback Mountain gorilla (Gorilla beringei) in the bamboo forest, this is Munyinya the leader of Hirwa group, Sabyinyo volcano, Volcano National Park, Rwanda

Christophe Courteau / Mountain gorillas (Gorilla beringei) Hirwa group led by the silverback dominant male Munyinya, Volcanoes National Park, Rwanda, elevation 2610 m

Christophe Courteau / Mountain gorilla silverback, male called Munyinya, (Gorilla beringei) with tourist taking photo, part of Hirwa Group, Volcanoes National Park, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei) baby in mother's arms, Susa group, Parc National des Volcans, Rwanda

Mary McDonald / Adult Mountain gorilla (Gorilla beringei beringei) holding baby , Hirwa group, Volcanoes National Park, Rwanda

Christophe Courteau / Mountain gorilla (Gorilla beringei) baby eating, part of Hirwa group, Volcanoes National Park. Rwanda, elevation 2630m

Christophe Courteau / Young Mountain gorilla (Gorilla beringei) this is Gakuru, one of 2 twin infants from female Kabatwa in Hirwa Group, on slopes of the Sabyinyo Volcano, Volcanoes National Park, Rwanda elevation 2610 m

Christophe Courteau / Young Mountain gorilla (Gorilla beringei) this is Gakuru, one of 2 twin infants from female Kabatwa in Hirwa Group, on slopes of the Sabyinyo Volcano, Volcanoes National Park, Rwanda elevation 2610 m

Christophe Courteau / Mountain gorilla (Gorilla beringei) mother with young from Hirwa group. This is Gakuru, one of 2 twin infants from female Kabatwa, on slopes of the Sabyinyo Volcano, Volcanoes National Park, Rwanda e...

Christophe Courteau / Mountain gorilla (Gorilla beringei) 4 week infant , Hirwa group, Volcanoes National Park, Rwanda, elevation 2610m

Christophe Courteau / Mountain gorilla (Gorilla beringei) female with her 4 weeks old infant in her arm, Hirwa group, Volcanoes National Park, Rwanda, elevation 2610m

Christophe Courteau / Young Mountain gorilla (Gorilla beringei), this is Gakuru, one of 2 twins infants from female Kabatwa, Hirwa group, slope of the Sabyinyo Volcano, Volcanoes National Park, Rwanda elevation 2610m

Christophe Courteau / Mountain gorilla (Gorilla beringei) young portrait, Hirwa group, Volcanoes National Park, Rwanda, elevation 2610m

Christophe Courteau / Mountain gorilla (Gorilla beringei) silverback at rest (named Munyinya), Hirwa group, Volcanoes National Park, Rwanda

Christophe Courteau / Mountain gorillas (Gorilla beringei) Hirwa group resting, led by the silverback dominant male Munyinya, Volcanoes National Park, Rwanda, elevation 2610 m

Christophe Courteau / Mountain gorillas (Gorilla beringei) Hirwa group led by the silverback dominant male Munyinya, Volcanoes National Park, Rwanda, elevation 2610 m

Christophe Courteau / Mountain gorilla (Gorilla beringei) female eating, part of Hirwa Group, Volcanoes National Park, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei) baby in mother's arms, Susa group, Parc National des Volcans, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) young gorilla beating its chest in habitat, Volcanoes NP, Virunga mountains, Rwanda

Andy Rouse / Mountain gorilla (Gorilla beringei beringei) young gorilla beating its chest, Volcanoes NP, Virunga mountains, Rwanda

Mary McDonald / Mountain gorilla (Gorilla beringei beringei) female playing in a river, Sabyinyo Volcano, Hirwa group, Volcanoes National Park, Rwanda. Endangered.

Mary McDonald / Mountain gorillas (Gorilla beringei beringei) playing in river, whilst infant beats its chest on riverbank, Sabyinyo Volcano, Hirwa group, Volcanoes National Park, Rwanda.

Mary McDonald / Mountain gorilla (Gorilla beringei beringei) troop playing in the river, Hirwa Group, Volcanoes National Park, Rwanda. Endangered.

Mary McDonald / Mountain gorilla (Gorilla beringei beringei) troop playing in river, Hirwa Group, Volcanoes National Park, Rwanda. Endangered.

Mary McDonald / Mountain gorilla (Gorilla beringei beringei) infant beating chest, Hirwa group, Volcanoes National Park, Rwanda. Endangered.

Mary McDonald / Mountain gorilla (Gorilla beringei beringei) silverbck eating bamboo, Hirwa group, Volcanoes National Park, Rwanda. Endangered.

Eric Baccega / Mountain gorilla (Gorilla beringei) newborn baby clinging to its mother's fur, member of the Hirwa group, Mgahinga National Park, Uganda.

Eric Baccega / Mountain gorilla (Gorilla beringei) newborn baby clinging to its mother's fur, member of the Hirwa group, Mgahinga National Park, Uganda

Eric Baccega / Mountain gorilla (Gorilla beringei) mother holding newborn, member of the Hirwa group, Mgahinga National Park, Uganda.

Eric Baccega / Mountain gorilla (Gorilla beringei) mother holding newborn, member of the Hirwa group, Mgahinga National Park, Uganda.