Vladimir Medvedev / Amur Leopard (Panthera pardus orientalis) on rocky slope at night, Kedrovaya Pad reserve, Primorskiy krai, Far East Russia, December, Critically endangered species.

Tui De Roy / Violet tailed sylph (Aglaiocercus coelestis) Guango private reserve, Papallacta Valley, Andean Cloud Forest, East slope, Ecuador

Tui De Roy / White bellied woodstar (Chaetocercus mulsant) three hovering around red flowers, Guango private reserve, Papallacta Valley, Andean Cloud Forest, East slope, Ecuador

Juan Carlos Munoz / Walia ibex (Capra walie) silhoutted on a rocky slope. Simien mountains, Ethiopia, Feb 2010

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) on slope, Kronotsky Zapovednik, Kamchatka, Far East Russia

Mike Potts / Harebells on east slope on Bardsey Island, with a lighthouse in the distance. North Wales, UK, August 2012

Vladimir Medvedev / Amur Leopard (Panthera pardus orientalis) on rocky slope at night, Kedrovaya Pad reserve, Primorskiy krai, Far East Russia, December, Critically endangered species.

Vladimir Medvedev / Amur Leopard (Panthera pardus orientalis) walking down rocky slope at night, Kedrovaya Pad reserve, Primorskiy krai, Far East Russia, February, Critically endangered species.

Tui De Roy / White bellied woodstar (Chaetocercus mulsant) in flight, Guango private reserve, Papallacta Valley, Andean Cloud Forest, East slope, Ecuador

Tui De Roy / White bellied woodstar (Chaetocercus mulsant) in flight, Guango private reserve, Papallacta Valley, Andean Cloud Forest, East slope, Ecuador

Tui De Roy / Long tailed woodcreeper (Deconychura longicauda) on tree trunk, San Isidro, Eastern Slope Tropical Andes, Andean Cloud Forest, East slope, Ecuador

Tui De Roy / Blue crowned / highland motmot (Momotus momota) San Isidro, Eastern Slope Tropical Andes, Andean Cloud Forest, East slope, Ecuador

Tui De Roy / Black and white owl (Strix nigrolineata) eyes red from camera flash, San Isidro, Eastern Slope Tropical Andes, Andean Cloud Forest, East slope, Ecuador

Alex Mustard / A long arm octopus (Octopus sp) looks out from its burrow in a rubble slope. Java Sea, Seraya, Tulamben, Bali, Indonesia, South East Asia

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 eating plant, Bwenge group, slope of the Karisoke Volcano, Volcanoes National Park, Rwanda, elevation 2930m

Christophe Courteau / Mountain gorilla (Gorilla beringei) young eating plant, Bwenge group, slope of the Karisoke Volcano, Volcanoes National Park, Rwanda, elevation 2930m

Christophe Courteau / Mountain gorilla (Gorilla beringei) female portrait, Bwenge Group, slope of the Karisoke Volcano, Volcanoes National Park, Rwanda, elevation 2930m

Christophe Courteau / Mountain gorilla (Gorilla beringei) eating berries, Bwenge Group, slope of the Karisoke Volcano, Volcanoes National Park, Rwanda, elevation 2930m

Christophe Courteau / Mountain gorilla (Gorilla beringei) eating berries, Bwenge Group, slope of the Karisoke Volcano, Volcanoes National Park, Rwanda, elevation 2930m

Christophe Courteau / Mountain gorilla (Gorilla beringei) silverback (Bwenge) of the Bwenge Group, slope of the Karisoke Volcano, Volcanoes National Park, Rwanda up at 2930m

Bryan and Cherry Alexander / Family group of Muskox (Ovibos moschatus) graze on the foliage of a tundra slope in Nordbugten, Nordvest Fjord, East Greenland, September.

Jenny E. Ross / An autumn storm sweeps across the Mono Basin from the east slope of the Sierra Nevada Mountains. Mono Lake, Mono Basin National Forest Scenic Area, October 1997.

Gerry Ellis / Chrysanthemum (Chrysanthemum sp) fields on east slope of Virunga Mountains with Mount Muhabura in the distance, Rwanda

Oriol Alamany / Desert plants growing below a rock slope near Anfashieh mountains, Wadi Rum Protected Area, Jordania

Patricio Robles Gil / Walia ibex (Capra ibex walie) feeding on steep slope, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Walia ibex (Capra ibex walie) male, females and young on steep slope, Simien Mountains NP, Ethiopia, Endangered

Bruno D'Amicis / Olive / Anubis baboon (Papio anubis) young sitting on steep slope, Kaffa, Southern Ethiopia, East Africa December 2008

Bruno D'Amicis / Olive / Anubis baboon (Papio anubis) young climbing steep slope with the aid of a liane, Kaffa, Southern Ethiopia, East Africa December 2008

Michael & Patricia Fogden / Misty ridges on east slope of the Andes, Ecuador

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) on grassy slope, Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Michael Pitts / Spoil slope from Ok Tedi mine, Star mountains, Papua New Guinea

Gerry Ellis / Park boundary clearly visible with bamboo forest on one side and farming from east slope of Mt Karisimbi on the other, Parc National Des Volcans, Rwanda

Gerry Ellis / Pyrethrum (Chrysanthemum cinerariaefolium) fields on east slope of Virunga National Park's former land that was cleared in 1967-68 with Mt Muhabura in distance at the edge of Parc National Des Volcans...

Sebastian Kennerknecht / Acacia (Acacia sp) and Dhofari Jatropha (Jatropha dhofarica) cloud forest on slope of escarpment, Hawf Protected Area, Yemen