David Pattyn / Common brown lemur (Eulemur fulvus) portrait, Anjajavy Private Reserve, north west Madagascar.

Edwin Giesbers / Barbary macaque (Macaca sylvanus) babies hand holding onto adults fur. Gibraltar Nature Reserve, Gibraltar

Cyril Ruoso / Verreaux's sifaka (Propithecus verreauxi) climbing tree in rainforest. Berenty Reserve, Madagascar.

Suzi Eszterhas / Cotton-top tamarin (Saguinus oedipus), adult carrying two week old twin babies on back. Northern Colombia.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female climbing tree. Sahamalaza, Madagascar.

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

Steven David Miller / Sulphur-crested cockatoo (Cacatua galerita) feeding on Spider flower (Grevillea sp) seed pods whilst perched. Lane Cove National Park, Sydney, New South Wales, Australia.

Sandesh Kadur / Bamboo lemur (Hapalmur griseus) in tree. Andasibe-Mantadia National Park, Madagascar.

Magnus Lundgren / Wild Wonders of China / Central Yunnan black crested gibbon (Nomascus concolor jingdongensis), mother and baby sitting in tree. Wuliangshan Nature Reserve, Jingdong, Yunnan Province, China.

Lucas Bustamante / Linda's torrenteer frog (Hyloscirtus lindae) close up of feet with orange pads, Papallacta, Napo, Ecuador .

David Pattyn / Coquerel's sifaka (Propithecus coquereli) juvenile in bamboo thicket, Anjajavy Private Reserve, north west Madagascar.

David Pattyn / Coquerel's sifaka (Propithecus coquereli) on tree trunk watching tourists at hotel, Anjajavy Private Reserve, north west Madagascar, September 2016.