Christophe Courteau / Hamadryas Baboon {Papio hamadryas} climbing palm tree in order to feed on nuts. Awash NP, Ethiopia

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) 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) dominant male silverback 'Makumba' aged 32 years moving through a tree, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republi...

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

Mark Hamblin / 2020VISION / Pine marten (Martes martes) juvenile, climbing pine tree in woodland, Beinn Eighe National Nature Reserve, Wester Ross, Scotland, UK, July

George Sanker / Black Bear (Ursus americanus) cub balancing on branch in tree, Yellowstone NP, Wyoming, USA

Rolf Nussbaumer / Northern raccoon (Procyon lotor) young at night climbing live Oak tree (Quercus virginiana) Dinero, Lake Corpus Christi, South Texas, USA.

Dr. Axel Gebauer / Red panda (Ailurus fulgens), climbing down tree, Darjeeling, India, captive

Uri Golman / Asiatic lion cub (Panthera leo persica) looking up into tree, possibly at a bird, Gir Forest NP, Gujarat, India

Andy Rouse / Silhouette of Leopard (Panther pardus) leaping up into a tree, Masai Mara GR, Kenya, February

Anup Shah / Proboscis monkey (Nasalis larvatus) male walking along a branch high in the forest canopy, Bako National Park, Sarawak, Borneo, Malaysia, March

Rolf Nussbaumer / Virginia creeper (Parthenocissus quinquefolia), climbing on Live Oak (Quercus virginiana) with fall colors, Kerrville, Hill Country, Central Texas, USA, November.

Terry Whittaker / 2020VISION / Pine marten (Martes martes) 4-5 month kit walking along branch in caledonian forest, The Black Isle, Highlands, Scotland, UK, July

Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) mature male 'Nanang' suspended between a tree and a liana - wide angle perspective. Pondok Tanggui, Tanjung Puting National Park, Central Kalimantan, Borneo,...

Sergey Gorshkov / Wolverine (Gulo gulo) climbing birch tree, Kamchatka, Far East Russia, April

Sergey Gorshkov / Wolverine (Gulo gulo) climbing birch tree, Kamchatka, Far East Russia, April

Andy Sands / Dormouse (Muscardinus avellanarius) climbing among berries of Black Byrony. Captive. UK, September.

Solvin Zankl / European tree frog (Hyla arborea) on tree branch, with lake behind, Germany

Solvin Zankl / Seven spot ladybird (Coccinella septempunctata) climbing on grass stem, Germany

Solvin Zankl / Eurasian red squirrel (Sciurus vulgaris) climbing in tree, Germany

Pete Oxford / Man (a balata bleeder, Anton Clarence) collecting natural latex from the Balata / Bullet wood tree (Manilkara bidentata), Katoka, Rupununi, Guyana, Model released

Suzi Eszterhas / Sumatran Orangutan (Pongo abelii) female grabbing the hand of her offspring, aged 1.5 years, North Sumatra, Indonesia. Critically Endangered

Angelo Gandolfi / Brown Bear (Ursus arctos) climbing tree, South Carpathian mountains, Romania

Alex Hyde / Close up of fore foot of Red fronted brown lemur {Lemur fulvus rufus}, Kirindy forest, West Madagascar

Rod Williams / Green / Emerald Tree Monitor (Varanus prasinus) head portrait climbing tree trunk. Captive, from Papua New Guinea, Indonesia

Andy Sands / Glow worm (Lampyris noctiluca) climbing on stem of grass, with tail emitting bioluminescence, England, UK, July

Alex Hyde / Indri (Indri indri) portrait, climbing tree, tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Alex Hyde / Indri (Indri indri) portrait, sitting in tree, tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Laurent Geslin / Red squirrel (Sciurus vulgaris) at foot of tree trunk in woodland, autumn, France.

Anup Shah / African lioness (Panthera leo) silhouetted climbing down a tree at dawn, Masai Mara National Reserve, Kenya. March.

Tim Laman / Wallace's flying frog (Rhacophorus nigropalmatus) on a tree trunk in the lowland rainforest, Danum Valley Conservation Area, Sabah, Borneo, Malaysia.

Tim Laman / Self portrait of biologist / photographer, Tim Laman, climbing a rope into the rainforest canopy in Borneo. Gunung Palung National Park, Borneo, West Kalimantan, Indonesia

Tim Laman / Orangutan researcher, Cheryl Knott, climbing rope into giant canopy tree with stranger fig tree roots growing down its side, Gunung Palung National Park, Borneo, West Kalimantan, Indonesia.

Tim Laman / Young boy aged 7 (model released) playing / climbing on Strangler fig (Ficus destruens) roots growing, tropical rainforest, Borneo, Malaysia

Suzi Eszterhas / Juvenile Chimpanzee (Pan troglodytes) climbing in vines. Tropical forest, Western Uganda.

Chris Gomersall / Two European brown bear (Ursus arctos) cubs climbing pine tree in taiga forest, Martinselkonen, Finland, June

Chris Gomersall / European brown bear (Ursus arctos) cub climbing pine tree, Finland, July

George Sanker / Black bear (Ursus americanus) cub, cinnamon phase, climbing fir tree, Yellowstone National Park, Wyoming, USA, June

George Sanker / Young Black bear (Ursus americanus) cub climbing mature fir tree, Yellowstone National Park, Wyoming, USA, May

Philippe Clement / European Brown bear (Ursus arctos) female climbed tree and is looking down at male bear, Bavarian Forest NP, Germany, Captive

Stephen Dalton / Red eyed tree frog (Agalychnis callidryas) climbing up plant stems, controlled conditions, from Central America

Nick Garbutt / Sloth bear (Melursus ursinus) climbing tree for fruit, Satpura National Park, India

Nick Garbutt / Sloth bear (Melursus ursinus) climbing tree for fruit, Satpura National Park, India

Michael Pitts / Malayan pangolin / Scaly anteater {Manis javanica} in tree, Komodo Island, Indonesia

Wild Wonders of Europe / Cairns / Photographer Peter Cairns climbing ladder to photograph Great grey owl (Strix nebulosa) in boreal forest, Northern Oulu, Finland, June 2008

Pete Oxford / Spectacled / Andean Bear (Tremarctos ornatus) cub in tree, Maquipucuna Foundation Cloud Forest Reserve, Andes, Ecuador, South America

Eric Baccega / Encounter of two Spectacled bears (Tremarctos ornatus) climbing in tree on a typical misty morning in the dry forest, Chaparri Ecological Reserve, Peru, South America

Dave Watts / Red Squirrel {Sciurus vulgaris} climbing Scots pine tree, Formby, UK

Jouan & Rius / Climbing plant growing up tree trunk in rainforest, Eungella National Park, Queensland, Australia

Jouan & Rius / Liana winding up trunk in rainforest, Lamington National Park, Queensland, Australia

Jouan & Rius / Wild vanilla in tropical rainforest, Masoala NP, Madagascar

James Aldred / Charlotte Uhlenbroek climbing in the canopy of a giant Mengaris tree {Koompassia excelsa} Danum valley, Sabah, Borneo, Malaysia, 2002. BBC NHU 'Jungles'

Shattil & Rozinski / Black bear cub climbing tree {Ursus americanus} Colorado, USA

Shattil & Rozinski / Black bear cubs climbing tree {Ursus americanus} Colorado, USA

Colin Varndell / Grey squirrels climbing tree trunk {Sciurus carolinensis} UK.

Doug Perrine / Coconut / Robber crab climbing palm tree {Birgus latro} Palau, Micronesia

Christoph Becker / Brown bear cub climbing tree (Urus arctos) Bayerischer Wald, Germany. captive

LYNN M. STONE / Two Giant pandas {Ailuropoda melanoleuca} one climbing tree, Wolong NR, Qionglai mts, Sichuan, China - captive

ASHISH & SHANTHI CHANDOLA / Liontail macaque climbing tree trunk {Macaca silenus} Anamalais WS, Tamil Nadu, India

Eric Baccega / Black bear cub (18m-old) climbing tree {Ursus americanus} Quebec, Canada.

Andrew Parkinson / Hikers climb A Chailleach in blizzard, Monadhliath mtns, Highlands, Scotland.

Anup Shah / Young African lion cub climbing tree {Panthera leo} Masai Mara, Kenya

Pete Oxford / Tailless whip scorpion, Ecuadorian Amazon

Tony Phelps / White lipped palm viper in tree {Trimeresurus albolabris} Thailand

Pete Oxford / Southern coati up tree {Nasua nasua} Amazon Ecuador, South America

Elio Della Ferrera / Rainforest interior with climbing plant around tree trunk, Uduwattakele FRWS, Sri Lanka

Anup Shah / Juvenile Chimpanzee Flirt in tree {Pan troglodytes schweinfurthii} Gombe NP Tanzania

Anup Shah / Juvenile Chimpanzee 'Flirt' in tree {Pan troglodytes schweinfurthii} Gombe NP Tanzania

Pete Oxford / Brown throated sloth with young hanging from branch. {Bradypus variegatus} Brazil, South America

Jabruson / Eastern lowland gorilla feeding in tree {Gorilla beringei graueri} Lake Kivu, Democratic Republic of the Congo

Pete Oxford / Golden bamboo lemur {Hapalemur aureus} eating bamboo, Ranamafana NP, Madagascar

Anup Shah / Female Chimpanzee 'Flirt' (daughter of Fifi) 2-years-7-months-old playing in tree {Pan troglodytes schweinfurtheii} Kasekela community, Gombe NP, Tanzania. 2002

Jabruson / Mbuti pygmy climbs forest tree. Epulu forest reserve, Dem Rep of Congo, Central Africa

David Pike / Japanese macaque {Macaca fuscata} sitting in conifer tree Jigokudani, Japan

Staffan Widstrand / Tropical rainforest lianas (climbing vines) Trinidad, Caribbean.

Fiona Rogers / Celebes / Black crested macaque (Macaca nigra) baby aged less than 1 month playing in a tree, Tangkoko National Park, Sulawesi, Indonesia.

Fiona Rogers / Celebes / Black crested macaque (Macaca nigra) baby aged less than 1 month playing in a tree, Tangkoko National Park, Sulawesi, Indonesia.

Anup Shah / Celebes / Black crested macaque (Macaca nigra) juvenile drinking water from a hollow in a tree, Tangkoko National Park, Sulawesi, Indonesia.

Anup Shah / Celebes / Black crested macaque (Macaca nigra) juvenile hanging from a branch, Tangkoko National Park, Sulawesi, Indonesia.

Anup Shah / Celebes / Black crested macaque (Macaca nigra) juvenile hanging from a branch, Tangkoko National Park, Sulawesi, Indonesia.

Suzi Eszterhas / Hoffmann's Two-toed Sloth (Choloepus hoffmanni) climbing a tree within Aviarios Sloth Sanctuary, Costa Rica

Suzi Eszterhas / Brown throated Three-toed Sloth (Bradypus variegatus) climbing tree with green algae on hair, Aviarios Sloth Sanctuary, Costa Rica

John Cancalosi / Raccoon (Procyon lotor) climbing tree, New York, USA

John Cancalosi / Raccoon (Procyon lotor) climbing tree, New York, USA

Ben Lascelles / Northern Tamandua (Tamandua mexicana opistholeuca) Soberania National Park, Panama, April

Ben Lascelles / Northern Tamandua (Tamandua mexicana opistholeuca) in tree, Soberania National Park, Panama, April

Ben Lascelles / Northern Tamandua (Tamandua mexicana opistholeuca) climbing tree, Soberania National Park, Panama, April

Ben Lascelles / Northern Tamandua (Tamandua mexicana opistholeuca) climbing tree, Soberania National Park, Panama, April

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years climbing a tree, Bossou Forest, Mont Nimba, Guinea. December 2010.

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years climbing a tree, Bossou Forest, Mont Nimba, Guinea. December 2010.

Anup Shah / Western chimpanzee (Pan troglodytes verus) young male 'Jeje' aged 13 years coming down from a tree, Bossou Forest, Mont Nimba, Guinea. January 2011.

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years swinging through trees, Bossou Forest, Mont Nimba, Guinea. December 2010.

Anup Shah / Western chimpanzee (Pan troglodytes verus) young male 'Jeje' aged 13 years coming down a tree, Bossou Forest, Mont Nimba, Guinea. January 2011.

Fiona Rogers / Western chimpazee (Pan troglodytes verus) male infant 'Flanle' aged 3 years playing in a tree, Bossou Forest, Mont Nimba, Guinea. January 2011.