Eric Baccega / Portrait of male silverback Mountain gorilla (Gorilla beringei beringei) feeding. Bwindi Impenetrable Forest National Park, Uganda, Africa

Enrique Lopez-Tapia / Mount Annapurna I (8091m) from base camp, with hikers and prayer flags silhouetted, Annapurna Sanctuary, central Nepal, November 2011.

Enrique Lopez-Tapia / The forests of the Modi Khola river valley shrouded in fog. Annapurna Sanctuary, central Nepal, November 2011.

Enrique Lopez-Tapia,Enrique Lopez-Tapia / View of the Baltoro Glacier, with mountains in the background, Central Karakoram National Park, Pakistan, June 2007.

Cheryl-Samantha Owen / Mountain gorilla portrait (Gorilla gorilla), Bwindi Impenetrable Forest, Uganda, East Africa

Cheryl-Samantha Owen / Mountain gorilla (Gorilla beringei) resting on back yawning, Bwindi Impenetrable Forest, Uganda, East Africa

Sean Crane / Mountain Gorilla (Gorilla gorilla beringei) mother and young, Bwindi Impenetrable National Park, Uganda

Adri de Visser / Mountain Gorilla (Gorilla gorilla beringei) in rain, Bwindi Impenetrable National Park, Uganda

Eric Baccega / Mountain gorilla (Gorilla beringei) mother with one month baby feeding in tree. Member of Katwe group. Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Mountain gorilla baby (Gorilla beringei) with mother. Bwindi Impenetrable Forest National Park, Uganda, Africa

Pedro Narra / Jackson's three-horned chameleon (Trioceros jacksonii) Bwindi Impenetrable Forest, Uganda.

Pedro Narra / Mountain gorilla (Gorilla beringei beringei) mother and infant, Bwindi Impenetrable National Park, Uganda.

Pedro Narra / Mountain gorilla (Gorilla beringei beringei) resting, close up of face, Bwindi Impenetrable National Park, Uganda.

Pedro Narra / Mountain gorilla (Gorilla beringei beringei) sleeping, close up of face, Bwindi Impenetrable National Park, Uganda.

Eric Baccega / Jackson's three-horned chameleon (Trioceros jacksonii) climbing on tree. Bwindi Impenetrable Forest, Uganda.

Eric Baccega / Jackson's three-horned chameleon (Trioceros jacksonii) climbing on tree. Bwindi Impenetrable Forest, Uganda.;Jackson's three-horned chameleon (Trioceros jacksonii) climbing on tree. Bwindi Impenetrabl...

Eric Baccega / Jackson's three-horned chameleon (Trioceros jacksonii) Bwindi Impenetrable Forest, Uganda.

Eric Baccega / Jackson's three-horned chameleon (Trioceros jacksonii) Bwindi Impenetrable Forest, Uganda.

Christophe Courteau / Edge of the Bwindi Impenetrable Forest NP, showing the pressure of development of agriculture, Uganda April 2011

Christophe Courteau / Edge of the Bwindi Impenetrable Forest NP, showing the pressure of development of agriculture, Uganda April 2011

Christophe Courteau / Deforestation for agriculture on hills near Bwindi Impenetrable Forest NP, Uganda.

Christophe Courteau / Deforestation for agriculture along border of Bwindi Impenetrable Forest NP, Uganda.

Christophe Courteau / Deforestation for agriculture on hills near Bwindi Impenetrable Forest NP, Uganda.

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) drinking from a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) drinking from a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) drinking from a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Two Mountain gorillas (Gorilla beringei beringei) standing in a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) drinking from a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Female Mountain gorilla (Gorilla beringei beringei) with infant on her back, drinking from a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Silverback Mountain gorilla portrait (Gorilla gorilla beringei), Bwindi Impenetrable Forest National Park, Uganda, Africa

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) drinking in a mountain stream. Bwindi Impenetrable Forest National Park, Uganda, Africa

David Tipling / RF - Schrader Glacier in Wilson Harbour, South Georgia. January 2015. (This image may be licensed either as rights managed or royalty free.)

Will Burrard-Lucas / Mountain gorilla (Gorilla beringei beringei) baby peering through a clearing in the leaves. Bwindi Impenetrable National Park, Uganda. November

Will Burrard-Lucas / Mountain gorilla (Gorilla beringei beringei) close up head portrait of adult. Bwindi Impenetrable National Park, Uganda. November

Will Burrard-Lucas / Mountain gorilla (Gorilla beringei beringei) adult scratching head. Bwindi Impenetrable National Park, Uganda. November

Will Burrard-Lucas / Long exposure of star trails over Virunga volcanoes seen from Bwindi Impenetrable National Park, Uganda. November

Eric Baccega / Tourists watching as guide explains the rule to stay at least 7 metres distance from Gorillas, Bwindi Impenetrable Forest, Uganda, February 2016.

Eric Baccega / Tourists watching as guide explains the rule to stay at least 7 metres distance from Gorillas, Bwindi Impenetrable Forest, Uganda, February 2016.

Juan Carlos Munoz / House in gorge next to steep cliff, Moustiers-Ste-Marie Village, Gorges du Verdon Natural Park, Alpes Haute Provence, France, June 2015.

Cheryl-Samantha Owen / Mountain gorilla (Gorilla gorilla) juvenile swinging from branch, Bwindi Impenetrable Forest, Uganda, East Africa

Inaki Relanzon / Mountain gorilla (Gorilla beringei) portrait, Bwindi Impenetrable Forest National Park, Uganda, Critically endangered, July 2011

Inaki Relanzon / Mountain gorilla (Gorilla beringei) sitting, Bwindi Impenetrable Forest National Park, Uganda, Critically endangered, July 2011

Inaki Relanzon / Mountain gorilla (Gorilla beringei) lying down, Bwindi Impenetrable Forest National Park, Uganda, Critically endangered, July 2011

Inaki Relanzon / Rear view of Mountain gorilla (Gorilla beringei) lying down, Bwindi Impenetrable Forest National Park, Uganda, Critically endangered, July 2011

Inaki Relanzon / Mountain gorilla (Gorilla beringei) showing stained teeth, Bwindi Impenetrable Forest National Park, Uganda, Critically endangered, July 2011

Inaki Relanzon / Warden in Bwindi Impenetrable Forest National Park, Uganda, July 2010

Inaki Relanzon / Foggy landscape at sunrise, Bwindi Impenetrable Forest National Park, Uganda, July 2010

Mark Carwardine / Bwindi Impenetrable Forest, home of the Mountain gorilla, Uganda, East Africa, October 2008