Lorraine Bennery / Red-bellied lemur (Eulemur rubriventer) huddling together in tree branches. Anjozorobe Special Reserve, Madagascar. Vulnerable species, endemic.

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

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) eight month old cubs playing in tree, Chengdu, Sichuan, China

Gabriel Rojo / White-banded tree-frog (Hypsiboas pulchellus) with Ladybird (Coccinellidae) Calden forest, La Pampa, Argentina

Chris Mattison / Green tree monitor (Varanus prasinus) with tongue out, captive from SE Asia.

Fergus Gill / Tree sparrows (Passer montanus) perching on a branch in the rain. Perthshire, Scotland, December.

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

Andy Rouse / Indri (Indri indri) portrait in tropical rainforest. Madagascar.

Mary McDonald / Hanuman Langur / Northern Plains Grey Langur (Semnopithecus entellus) in leafless tree top. Kanha National Park, Madhya Pradesh, India.

Niall Benvie / A pair of Ravens (Corvus corax) perched in bleached out pine tree, Estonia, March 2008

Stephen Dalton / Hedgesparrow / Dunnock (Prunella modularis)feeding European cuckoo (Cuculus canorus) in oak tree, UK

Patricio Robles Gil / Silhouette of young Gelada baboons (Theropitecus gelada) playing in tree at dawn, Simien Mountains NP, Ethiopia