Michael & Patricia Fogden / Oriental Whip Snake (Ahaetulla prasina) camouflaged among vines in the rainforest, southeast Asia

Stephen Downer / John Downer P / Vine snakes (Dryophis nasuta) imitate curled tendrils of foliage to conceal themselves in the rainforest (Resolution restriction - image digitised from film, 'Weird Nature' tv series)

Duncan Murrell / Green vine snake (Ahaetulla nasuta), Sinharaja Forest Reserve, Unesco Biosphere Reserve and World Heritage Site, Sri Lanka. The green vine snake changes from pure green to chequered markings when it f...

Paul Bertner / Green-striped Vine Snake (Philodryas argentea), Yasuni National Park, Ecuador

Yashpal Rathore / Green vine snake (Aheatulla nasuta), Agumbe, Karnataka, Western Ghats, India.

Yashpal Rathore / Green vine snake (Aheatulla nasuta), Agumbe, Karnataka, India.

Yashpal Rathore / Green vine snake (Aheatulla nasuta), Agumbe, Karnataka

Pete Oxford / Vine Snake (Oxybelis brevirostris), Ecuador

Pete Oxford / Vine Snake (Oxybelis brevirostris), Ecuador

Konrad Wothe / Green-striped vine snake (Xenoxybelis argenteus) Panguana Reserve, Huanuco province, Amazon basin, Peru.

Konrad Wothe / Green Vine Snake (Oxybelis fulgidus) flicking tongue, Panguana Nature Reserve, Peru

Paul Williams / Man holding juvenile vine snake (Ahaetulla nasuta), Agumbe, Thirthahalli taluk, Malnad, Karnataka, India, July.