Anup Shah / African Lion (Panthera leo) juvenile reaching out with curiosity, Masai Mara National Reserve, Kenya. March

Claudio Contreras / Devil's hand Tree (Chiranthodendron pentadactylon) flower, Filo de Caballos, Sierra Madre del Sur, southern Mexico, March

Juergen Freund / Hand-reared Boongary (Dendrolagus lumholtzi) feeding in a kitchen, Atherton Tablelands, Queensland, Australia.

Juergen Freund / Hand-reared Boongary (Dendrolagus lumholtzi) descending from a tree and climbing onto its carer's back, Atherton Tablelands, Queensland, Australia.

Cyril Ruoso / Keeper feeding Common woolly monkeys (Lagothrix lagotricha) in Ikamaperou Sanctuary, Amazon, Peru. October 2006.

Cyril Ruoso / Common woolly monkey (Lagothrix lagotricha) reaching forward, Ikamaperou Sanctuary, Amazon, Peru.

Staffan Widstrand / Mangrove planting team from CRINEO planting Mangrove trees (Rhizophora) Pulicat Lake, Tamil Nadu, India, February 2013.

Mark Hamblin / 2020VISION / RSPB staff warden hand sawing pine tree to create open habitat in woodland, RSPB Abernethy Forest Reserve, Cairngorms National Park, Scotland, UK, September 2011. Model released.

Terry Whittaker / 2020VISION / Woman leaning against tree, feeding Grey Squirrel (Sciurus carolinensis) in parkland, Regent's Park, London, UK, April 2011, Model released.

Tim Laman / A young boy (model released) aged 9, crossing a fallen tree bridge with a hand rope that spans the river, at the research station in Gunung Palung NP. Borneo. July 2007

Michael Durham / A three year old boy with a Pacific Tree Frog (Pseudacris regilla)

Pete Oxford / Strawberry Tree Frog (Hyla pantosticta) male on a bromeliad in the cloud forest, Carchi Province, northeastern Ecuador

Claus Meyer / Tiger-striped Leaf Frog (Phyllomedusa tomopterna) waving, Amazon rainforest, Brazil

Tui De Roy / Scarlet Macaw (Ara macao) pair perched on tree limb, originally hand raised by the research center, they are now living in the rainforest canopy, Tambopata-Candamo Reserve, Amazon Basin, Peru

Edwin Giesbers / Person using mobile phone to photograp Lemon-yellow tree frog (Hyla savignyi) Cyprus. April.

Suzi Eszterhas / North American beaver (Castor canadensis) kit playing with Willow (Salix sp) at water's edge. Martinez, California, USA. June.

Suzi Eszterhas / Buff-cheeked gibbon (Nomascus gabriellae) looking out from behind tree trunk. Native to Asia. Captive.

Juergen Freund / Margit Cianelli with hand raised Lumholtz tree kangaroo (Dendrolagus lumholtzi) 'Kimberley' and her semi wild son 'Monty' following her into the house after a day out in the forest. Lu...

Claudio Contreras / Devil's Hand Tree (Chiranthodendron pentadactylon) flower, Filo de Caballos, Sierra Madre del Sur, southern Mexico, March

Nick Upton / Researcher labelling collection tube of Siberian flying squirrel (Pteromys volans) droppings. Droppings found below old deciduous tree with suitable nest hole. Muraka Forest Reserve, near Lisaku, Ida...

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei) juvenile, close-up of hand holding onto Eucalyptus tree. Outside of Volcanoes National Park, Rwanda.

Karine Aigner / Map of Kirtland's warbler (Setophaga kirtlandii) nests drawn by researcher, in Jack pine forest habitat. Michigan, USA, July 2017.

Karine Aigner / Researcher pulls back the undergrowth to reveal the ground nest of a Kirtland's warbler (Setophaga kirtlandii) family, Michigan, USA, July 2017.

Karine Aigner / Portrait of a male Kirtland's warbler (Setophaga kirtlandii) held up in scientists hands, in breeding grounds of Jack Pine habitat. Michigan, USA, July 2017.

Juergen Freund / Hand-reared Boongary (Dendrolagus lumholtzi) feeding in a kitchen, Atherton Tablelands, Queensland, Australia.

Nick Garbutt / Giant waxy monkey / Leaf frog (Phyllomedusa bicolor) climbing on branch in rainforest canopy at night. Manu Biosphere Reserve, Peru.

Ashley Cooper / Soil turned to dust and Almond groves chopped down as there is no longer water available to irrigate them during 2012-2017 California drought, Wasco, California, USA, September 2014.

David Fleetham / Four Seasons Resort over looking beach and palm tree's at Hulopo'e Beach Park, Lanai Island, Hawaii, USA.

Staffan Widstrand / Karst island archipelago, Triton Bay, Mainland New Guinea, Western Papua, Indonesian New Guinea.

Paul Bertner / Green Tree Ant (Oecophylla smaragdina) biting person, Angkor Wat, Cambodia

Paul Bertner / Green Tree Ant (Oecophylla smaragdina) on finger, Angkor Wat, Cambodia

Nick Hawkins / Spring peeper (Pseudacris crucifer) on human hand, photographed with white background, New Brunswick, Canada, May.

Tim Laman / View into into canopy of montane rainforest at 2200 m elevation in the Arfak Mountains, West Papua, Indonesia.

Tim Laman / View into into canopy of montane rainforest at 2200 m elevation in the Arfak Mountains, West Papua, Indonesia.

ZSSD / Golden Mantella (Mantella aurantiaca) female with eggs, San Diego Zoo, California

Suzi Eszterhas / Aye-aye (Daubentonia madagascariensis) feeding on insects dug from a tree with long finger, Duke Lemur Center, North Carolina

Suzi Eszterhas / Aye-aye (Daubentonia madagascariensis) digging for insects in tree with long finger, Duke Lemur Center, North Carolina

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) females hand holding tree. Gombe National Park, Tanzania.

Pascal Pittorino / Mediterranean tree frog (Hyla meridionalis) juvenile, on a human finger, Var, Provence, France, June.

Steve O. Taylor (GHF) / Palm oil kernels held in hand, West Kalimantan, Indonesian Borneo. August 2010.

Steve O. Taylor (GHF) / Palm oil kernel in hands, West Kalimantan, Indonesian Borneo. August 2010.

Anup Shah / Tana mangabey (Cercocebus galeritus) drinking from rainwater gathered in the hollow of a tree. Tana River Forest, South eastern Kenya.

Fiona Rogers / Tana mangabey (Cercocebus galeritus) using its hand to scoop rainwater from a hollow in a tree for drinking. Tana River Forest, South eastern Kenya.

Enrique Lopez-Tapia / Man holding Madagascar boa (Sanzinia madagascariensis) Ranomafana National Park, Madagascar.

Sean Crane / Koala (Phascolarctos cinereus) paw clinging to a tree, Queensland, Australia

Ernie Janes / Seedling oak (Quercus robur) held in hand.

David Tipling / Hand coloured etching plate (Plate 16) of Ivory-billed woodpecker (Campephilus principalis) The Natural History of Carolina, Florida and the Bahama islands (1731-43) Vol. 1 by Mark Catesby. Criticall...

Colin Varndell / Sweet chestnut (Castanea sativa) nuts held in hands, Dorset, UK October,

Tom Gilks / Hand plucking Khat (Catha edulis) from tree, Meru region, Kenya.

Anup Shah / Sumatran orangutan (Pongo abelii) female 'Juni' aged 12 years feet gripping a tree. Gunung Leuser National Park, Sumatra, Indonesia. Rehabilitated and released (or descended from those which were rele...

Jabruson / Adult Chimpanzee in fruiting tree with wire snare damaged hand, in fruiting tree (Pan troglodytes schweinfurthii). Tongo, Virunga National Park, Kivu, Democratic Republic of Congo

Nick Upton / Three Backwell Enviromental Trust volunteers coppicing young trees using hand saws and axes to increase biodiversity and to improve the woodland habitat for Hazel Dormice (Muscardinus avellanarius) ne...

Nick Garbutt / Golden-crowned Sifaka or Tattersall's Sifaka (Propithecus tattersalli) climbing down tree in forests near Andranotsimaty, Daraina, north east Madagascar. Critically Endangered.

Dr. Axel Gebauer / Dove tree (Davidia involucrata) in bloom, Emei Shan, Sichuan, China

Dr. Axel Gebauer / Dove tree (Davidia involucrata) in bloom, Emei Shan, Sichuan, China

Dr. Axel Gebauer / Dove tree (Davidia involucrata) flower, Emei Shan, Sichuan, China

Dr. Axel Gebauer / Dove tree (Davidia involucrata) in bloom, Emei Shan, Sichuan, China

Cyril Ruoso / Orangutan (Pongo pygmaeus) adult sitting in tree holding his head in his hand, Kalimantan, Indonesia

Cyril Ruoso / Bonobo (Pan paniscus) detail of hand on a tree trunk, ABC Sanctuary, Democratic Republic of the Congo

Suzi Eszterhas / Chimpanzee (Pan troglodytes) hand on tree, tropical forest, Western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) infant, aged one and a half playing in tree, in tropical forest, Western Uganda

Daniel Heuclin / Ornate Schott's tree Lizard (Urosaurus ornatus schotti) held in hand, Organ Pipe Cactus national Monument. Arizona, April

Fiona Rogers / Western chimpanzee (Pan troglodytes verus) infant male 'Flanle' aged 3 years playing on ground, Bossou Forest, Mont Nimba, Guinea. January 2011.

Christophe Courteau / Mountain Gorilla (Gorilla beringei) hand on tree, Volcanoes National Park, Rwanda. Altitude of 2700m, short dry season, February

Christophe Courteau / Arm of wild chimpanzee (Pan troglodytes schweinfurthii), with hand gripping tree branch. Kibale National Park, Uganda

Kerstin Hinze / Forest dormouse (Dryomys nitedula) adult feeding in apple tree, Bulgaria, captive, hand raised

Wild Wonders of Europe / Möllers / Rusting hand grenades deposited during borderland fights in WWII at the trunk of a Common / European beech (Fagus sylvatica) near the Polish - Slovakia border, Jaraba Skala Nature Reserve, Runina area...

John Cancalosi / Boy looking at Gliding Leaf Frog (Agalychnis spurrelli) held in his hand, Costa Rican tropical rainforest. Model released.

Suzi Eszterhas / Thomas's leaf monkey / langur (Presbytis thomasi) close up of hand on tree, North Sumatra, Indonesia

Terry Whittaker / 2020VISION / Woman leaning against tree trunk, feeding Grey Squirrel (Sciurus carolinensis) in parkland, Regent's Park, London, UK, April 2011, Model released.

Florian Möllers / Golden snub-nosed monkey (Rhinopithecus roxellana qinlingensis) hand of subadult clinging to a tree, Zhouzhi Nature Reserve, Qinling mountains, Shaanxi, China, April 2006

Pete Oxford / Small Tree-Finch (Camarhynchus parvulus) studied for avian pox showing pox growth on foot, highlands of Santa Cruz Island, Galapagos Islands, Ecuador

Pete Oxford / Small Tree-Finch (Camarhynchus parvulus) studied for avian pox showing leg bands, highlands of Santa Cruz Island, Galapagos Islands, Ecuador

Pete Oxford / Small Tree-Finch (Camarhynchus parvulus) studied for avian pox having blood drawn, highlands of Santa Cruz Island, Galapagos Islands, Ecuador

Tim Laman / Wallace's flying frog (Rhacophorus nigropalmatus) held in photographer's hand, Danum Valley Conservation Area, Sabah, Borneo, Malaysia.

Andrew Parkinson / Southern plains grey / Hanuman langur {Semnopithecus dussumieri} an adult male sits in tree with his head resting on his hand. Bandhavgarh National Park, Madhya Pradesh, India.

Mark Moffett / Researcher holding bark cross-section showing Bark Beetle larvae in fir tree

Juergen Freund / White-lipped Tree Frog (Litoria infrafrenata) on hand, Queensland, Australia

Niall Benvie / Child's hand feeling Pine bark, UK

Pete Oxford / Large winged seeds of Amarillo tree held in hand, {Centrolobium ochroxylum} Cerro Blanco, Ecuadpr

Michael Durham / A three year old boy with a Pacific Treefrog (Pseudacris regilla)

Niall Benvie / Detail of annular tree rings in a hand-made wooden box, Scotland.

Pete Oxford / Strawberry Tree Frog (Hyla pantosticta) male in cloud forest, Carchi Province, Ecuador

Ingo Arndt / Red-eyed Tree Frog (Agalychnis callidryas) detail of foot

Ingo Arndt / Red-eyed Tree Frog (Agalychnis callidryas) detail of foot and eye

Pete Oxford / Brown Capuchin (Cebus apella) in tree with finger inside cracked open Piassava Palm (Attalea funifera) nut, Cerrado habitat, Piaui State, Brazil

Heidi & Hans-Juergen Koch / Caribbean Tree Frog (Eleutherodactylus coqui) young frog on a person's finger tip, native to Puerto Rico

Ross Hoddinott / Bark stripped from young tree by Roe deer {Capreolus capreolus} Cornwall, UK

Klaus Echle / Garden dormouse in tree {Eliomys quercinus} Germany Hand raised individual.

Klaus Echle / Garden dormouse {Eliomys quercinus} in beech tree, Germany, hand raised individual released back into wild

Klaus Echle / Garden dormouse juveniles at nest hole in tree {Eliomys quercinus} Germany hand raised

Klaus Echle / Garden dormouse disappearing into nest hollow in tree {Eliomys quercinus} Germany. hand-raised

Klaus Echle / Garden dormouse in beech tree {Eliomys quercinus} Germany. hand-raised hand raised