George Sanker / Ellis River high in White Mountain National Forest. New Hampshire, October 2012.

Jabruson / African Forest elephant (Loxodonta africana cyclotis) bull at edge of Dzanga Bai in early evening, Dzanga-Ndoki National Park, Central African Republic

Jabruson / African Forest elephant (Loxodonta africana cyclotis) subadult scenting air, blurred motion at dusk, Dzanga Bai, Dzanga-Ndoki National Park, Central African Republic

Jabruson / 'Patasse' - a male member of the Ba'Aka ethnic group from the village of Mossapoula, a tribe that have lived around Dzanga Ndoki National park for thousands of years and still depend on forest resourc...

Jabruson / Sundevall's Leaf-nosed Bats (Hipposideros caffer) in flight in forest roosting cave. Bai Hokou, Dzanga-Ndoki National Park, Central African Republic.

Mark Carwardine / Sumatran rhino (Dicerorhinus sumatrensis) walking in forest, from low-angle. Captive-Sumatran Rhino Sanctuary, within Way Kambas National Park, Lampung Province, southern Sumatra, Indonesia

Mark Carwardine / Sumatran rhino (Dicerorhinus sumatrensis) browsing on forest vegetation. Captive-Sumatran Rhino Sanctuary, within Way Kambas National Park, Lampung Province, southern Sumatra, Indonesia

Mark Carwardine / Sumatran rhino (Dicerorhinus sumatrensis) browsing on forest vegetation. Captive-Sumatran Rhino Sanctuary, within Way Kambas National Park, Lampung Province, southern Sumatra, Indonesia

Mark Carwardine / Close up of Sumatran rhino (Dicerorhinus sumatrensis) browsing on forest vegetation. Captive-Sumatran Rhino Sanctuary, within Way Kambas National Park, Lampung Province, southern Sumatra, Indonesia

Jack Dykinga / Bark patterns of Aspen tree (Populus tremula) in front of a Ponderosa pine (Pinus ponderosa) trunk, Kaibab National Forest, Arizona, USA

Oriol Alamany / Nigel Creek with conifer forest at dusk, Banff National Park, Rocky Mountains, Alberta, Canada

Mark Taylor / Forest fire at night with silhouetted trees, Yellowstone National Park, Wyoming, USA