Laurent Geslin / European brown bear {Ursos arctos} rubbing back against tree trunk in snow, captive, Switzerland, February

Theo Bosboom / Autumn trees with Bracket fungi, Leuvenumse bos, the Netherlands, November

Cyril Ruoso / Tree trunks logged by German company and certificated as legal wood from the Congo forest, destination Europe, Democratic Republic of the Congo

David Woodfall / Sessile oak (Quercus petraea) tree with sunlight behind, ancient semi natural woodland in Gilfach Nature Reserve, Radnorshire Wildlife Trust, Powys, Wales, UK May

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) female 'Malui' feeding on rotting wood from a hole in a tree, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic. Decembe...

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) dominant male silverback 'Makumba' aged 32 years feeding on rotten wood from a tree while his juvenile son 'Tembo' aged 4 years waits his turn, Bai Ho...

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) dominant male silverback 'Makumba' aged 32 years climbing down a tree, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic...

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) sub-adult male 'Kunga' aged 13 years climbing down a tree, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic. December 2...

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) juvenile male 'Mobangi' aged 5 years reaching into a hole in a tree for rotting wood to feed on, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve...

Matthew Maran / Base of large Oak tree in Richmond Park, London, UK March 2012

Sandra Bartocha / English oaks (Quercus robur) trees with snow on trunks, Gespensterwald / Ghost wood, Nienhagen, Germany, January

Sandra Bartocha / European Beech (Fagus sylvatica) woodland in the mist, Serrahn, Muritz National Park, Germany, World Natural Heritage Site, November