Chien Lee / Minden / White-footed Sportive Lemur (Lepilemur leucopus) in cavity, Madagascar

Bernard Castelein / Sanford's brown lemur (Eulemur sanfordi) male and female in tree, Ankarana National Park, Madagascar

Bernard Castelein / Ankarana sportive lemur (Lepilemur ankaranensis), Ankarana National Park, Madagascar

Shattil & Rozinski,Shattil & Rozinski / Black bear (Ursus americanus) cub climbing a fence, Minnesota, USA, May.

XI ZHINONG / Phayre's leaf monkey (Trachypithecus phayrei), wild animal in tree, Endangered species, Gaoligong Mountains of Yunnan Province, China.

Dr. Axel Gebauer / Red panda (Ailurus fulgens), pair resting in tree during monsoon season, Gangtok, Sikkim, India, captive

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

Kerstin Hinze / Fat / Edible dormouse (Glis glis) Lower Saxony, Germany, captive

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,...

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

Stephen Dalton / Green cat snake (Boiga cyanea) defensive behaviour, a rear-fanged arboreal rainforest species, controlled conditions, from India and SE Asia

Stephen Dalton / Green cat snake (Boiga cyanea) striking, a rear-fanged arboreal rainforest species, controlled conditions, from India and SE Asia

David Tipling / Philippine tarsier (Tarsius syrichta) on branch, Bohol, Philippines

Juan Carlos Munoz / Grey gibbon (Hylobates muelleri) swinging from branch in rainforest and using foot to grip plant vine, Mount Kinabalu NP, Sabah, Borneo, Malaysia

Tim Laman / Proboscis monkey (Nasalis larvatus) juvenile playing by swinging from a vine. Kinabatangan Wildlife Sanctuary, Sabah, Malaysia, Borneo, Endangered

Anup Shah / Sumatran Orang utan female with young resting in nest made in tree (Pongo pygmaeus abelii) Gunung Leuser NP, Sumatra, Indonesia

Anup Shah / Chimpanzee swinging through trees, Gombe NP, Tanzania 2003 'Fanni'

Anup Shah / Sumatran Orang utan baby hanging upsidedown in tree {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

Anup Shah / Sumatran Orang utan baby swinging in tree {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

Pete Oxford / Long haired / White bellied spider monkey hanging in tree by tail {Ateles belzebuth} Manu NP,

Anup Shah / Young Chimpanzee hanging upside down in tree {Pan troglodytes schweinfurtheii} Gombe NP, Tanzania. 2002

Staffan Widstrand / Brownthroated / Three-toed sloth carrying young {Bradypus variegatus} Brazil.

Anup Shah / Abstract Sumatran orang utan swinging through forest with infant {Pongo pygmaeus abelii} Gunung Leuser NP CR Indonesia

Anup Shah / Bonnet macaque {Macaca radiata} sitting in tree canopy, Periyar NP, Kerala, India

Anup Shah / White handed gibbon hanging from branch {Hylobates lar} C

Anup Shah / Orang utan high in tree of rainforest canopy, (Pongo abelii) Leuser NP, Indonesia

Anup Shah / Orang utan swinging through rainforest tree canopy, (Pongo abelii) Leuser NP, Indonesia

Anup Shah / Close up of Hoffmann's two toed sloth limbs and claws {Choloepus hoffmanni} species native to South America

Pete Oxford / Brown throated three toed sloth {Bradypus variegatus} climbing tree. Amazon, Brazil

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

Anup Shah / Baby Orang utan climbing liana {Pongo abelii} Gunang Leuser NP, Indonesia

Anup Shah / Orang utan in forest, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan silhouetted in trees, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Spider monkey in tree. Note prehensile tail

Anup Shah / Siamang gibbon male calling, pouch inflated

Anup Shah / Female orang utan mother with 7-month-old baby hanging in tree (Pongo abelii) Leuser NP Indonesia

Luciano Candisani / Brown-throated Three-toed Sloth (Bradypus variegatus) in atlantic Rainforest, Brazil

Suzi Eszterhas / Hoffmann's Two-toed Sloth (Choloepus hoffmanni) mother and young, Puerto Viejo de Talamanca, Costa Rica

Suzi Eszterhas / Brown-throated Three-toed Sloth (Bradypus variegatus) mother with four-month-old young, Puerto Viejo de Talamanca, Costa Rica

Suzi Eszterhas / Brown-throated Three-toed Sloth (Bradypus variegatus) four-month-old young, Puerto Viejo de Talamanca, Costa Rica

Suzi Eszterhas / Brown-throated Three-toed Sloth (Bradypus variegatus) male hanging in vine, Puerto Viejo de Talamanca, Costa Rica

Christian Ziegler / Kinkajou (Potos flavus) feeding on Balsa Tree (Ochroma lagopus) flower nectar at night, Barro Colorado Island, Panama

Christian Ziegler / Kinkajou (Potos flavus) feeding on Balsa Tree (Ochroma lagopus) flower nectar at night, Barro Colorado Island, Panama

Christian Ziegler / Olingo (Bassaricyon gabbii) feeding on Balsa Tree (Ochroma lagopus) flower nectar at night, Barro Colorado Island, Panama

Christian Ziegler / Brown-throated Three-toed Sloth (Bradypus variegatus) hanging from branch, Panama

Christian Ziegler / Woolly Opossum (Caluromys philander) feeding on Balsa Tree (Ochroma lagopus) flower nectar at night, Barro Colorado Island, Panama

Sean Crane / Brown-throated Three-toed Sloth (Bradypus variegatus) in tree showing fur covered in green algae, Pavones, Costa Rica

Juergen & Christine Sohns / Bonobo (Pan paniscus) mother and young, native to central Africa