Juergen Freund / Sugar Glider (Petaurus breviceps) feeding on sap from a tree trunk. Atherton Tablelands, Queensland, Australia

Anup Shah / Celebes / Black crested macaque (Macaca nigra) 'Alpha' baby female aged about 1 month hanging upside down in a tree, Tangkoko National Park, Sulawesi, Indonesia.

Anup Shah / Celebes / Black crested macaque (Macaca nigra) sub-adult male resting on a fallen tree, Tangkoko National Park, Sulawesi, Indonesia.

Markus Varesvuo / Common Crossbill (Loxia curvirostra) female foraging on a spruce cone. Kuusamo, Finland, February.

Chris Gomersall / Red squirrel (Sciurus vulgaris) on tree trunk, in pine forest, Speyside, Scotland, July

Tony Heald / Malayan colugo (Cynocephalus variegatus) hanging upside-down in tree feeding on algae at night, Danum Valley, Sabah, Borneo, September

Mitsuaki Iwago / Giant Panda (Ailuropoda melanoleuca) cub playing in a tree, China

Anup Shah / Playful Vervet monkey in tree (Chlorocebus / Cercopithecus aethiops) Samburu NR, Kenya

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

Doug Gimesy / Grey-headed flying-foxes (Pteropus poliocephalus) hang from a branch during a light summer rain shower. Yarra Bend Park, Kew, Victoria, Australia. November.

Ann & Steve Toon / Old honeycomb on baobab (Adansonia digitata), Chobe National Park, Botswana.

Steven David Miller / Rainbow lorikeet (Trichoglossus moluccanus) hanging down from tree. Ulladulla, New South Wales, Australia.