Alan Watson / Baobab tree (Adansonia rubrostipa) and Sogno (Didierea madagascariensis) in spiny forest, Reniala Reserve, Madagascar

Alan Watson / View of the forest floor with twisted vines, Ranomafana National Park, Madagascar

Alan Watson / Montane rainforest canopy and clouds at 1,200 metres, Ranomafana National Park, Madagascar January 2009

Alan Watson / Moss-covered Oak trees (Quercus petraea) and boulders, Tomies Wood, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Watson / Heart-shaped patch of lungwort (Lobaria virens) on the moss-covered trunk of Oak tree (Quercus petraea) and Holly trees (Ilex aquifolium) temperate forest, Tomies Wood, Killarney National Park, County...

Alan Watson / Heart-shaped patch of lungwort (Lobaria virens) on the moss-covered trunk of Oak tree (Quercus petraea) and Holly trees (Ilex aquifolium) temperate forest, Tomies Wood, Killarney National Park, County...

Alan Watson / Alpine paintbrush (Castilleja rhexifolia) in an alpine meadow along the Rockwall trail, Kootenay National Park, British Columbia, Canada. (World Heritage Site)July 2009

Alan Watson / Frond pattern of tree ferns (Cyathea arborea) in lowland tropical rainforest at 420 metres, Loma Quita Espuela Scientific Reserve, Dominican Republic.

Alan Watson / Frond pattern of tree ferns (Cyathea arborea) in lowland tropical rainforest at 420 metres, Loma Quita Espuela Scientific Reserve, Dominican Republic.

Alan Watson / Storm clouds approaching over tropical rainforest growing on limestone island, Los Haitises National Park, Dominican Republic, Caribbean, October 2009

Alan Watson / Bamboo (Dendrocalamus sp) near buttress tree, in lowland tropical rainforest, Khao Sok National Park, Surat Thani Province, Thailand

Alan Watson / Buttress roots of (Tetrameles nudiflora) in tropical rainforest, Khao Yai National Park, Nakhon Ratchasima Province, Thailand

Alan Watson / Buttress roots of tree (Tetrameles nudiflora) in tropical rainforest, Khao Yai National Park, Nakhon Ratchasima Province, Thailand

Alan Watson / Dead mangrove North of Mangily, Madagascar January 2009

Alan Watson / Herd of domestic goats among degraded mangroves, North of Mangily, Madagascar January 2009

Alan Watson / Fisherman in pirogue boat near Mangily, Madagascar January 2009

Alan Watson / Baobab tree (Adansonia rubrostipa) and Fengoke tree (Delonix decaryi) (centre) Reniala Reserve, Madagascar

Alan Watson / Pachypodium tree (Pachypodium geayi) Sogno (Didierea madagascariensis) in spiny forest, Reniala Reserve, Madagascar

Alan Watson / Baobab trees (Adansonia rubrostipa) and Sogno (Didierea madagascariensis) in spiny forest, Reniala Reserve, Madagascar

Alan Watson / Baobab trees (Adansonia rubrostipa) and Sogno (Didierea madagascariensis) in spiny forest, Reniala Reserve, Madagascar

Alan Watson / Baobab trees (Adansonia rubrostipa) and Sogno (Didierea madagascariensis) in spiny forest, Reniala Reserve, Madagascar

Alan Watson / Baobab trees (Adansonia rubrostipa) and Sogno (Didierea madagascariensis) in spiny forest, Reniala Reserve, Madagascar January 2009

Alan Watson / Warty chameleon (Furcifer verrucosus) climbing through vegetation in spiny forest, Reniala Reserve, southwest Madagascar

Alan Watson / Madagascar spiny-tailed lizard (Oplurus cuvieri) in red sand, Reniala Reserve, Madagascar

Alan Watson / 'Three eyed' lizard (Chalarodon madagascariensis) amoungst dead leaves, Reniala Reserve, Madagascar

Alan Watson / Assassin bugs (Platymeris sp) on tree trunk in tropical deciduous forest, Zombitse-Vohibasia National Park, Madagascar

Alan Watson / Detail of trunk of Romby tree (Commiphora mahafaliensis) in tropical deciduous forest, Zombitse-Vohibasia National Park, Madagascar

Alan Watson / Palm tree (Bismarkia nobilis) native to Madagascar, and sandstone rock formations, Isalo National Park, Madagascar

Alan Watson / Palm trees (Bismarkia nobilis) native to Madagascar, and sandstone rock formations, Isalo National Park, Madagascar January 2009

Alan Watson / Palm trees (Bismarkia nobilis) native to Madagascar, and sandstone rock formations, Isalo National Park, Madagascar January 2009

Alan Watson / Palm trees (Bismarkia nobilis) native to Madagascar, and sandstone rock formations, Isalo National Park, Madagascar January 2009

Alan Watson / Male Oustalet's chameleon (Furcifer oustaleti) sitting on branch, near Ihosy, Madagascar

Alan Watson / Granite Rock Formation, Near Ihosy, Madagascar January 2009

Alan Watson / Female Oustalet's chameleon (Furcifer oustaleti) climbing through dense foliage, near Ihosy, Madagascar

Alan Watson / Female Oustalet's chameleon (Furcifer oustaleti) walking on ground, near Ihosy, Madagascar

Alan Watson / Tree frog (Gephyromantis spinifer) sitting on leaf in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Frog's eggs on a leaf in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Tree frog (Gephyromantis spinifer) in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Leaf-tailed gecko (Uroplatus fantasticus) climbing tree trunk and missing its tail, in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Camouflaged caterpillar on a tree trunk in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Tree frog (Boophis guibei) resting in dead leaf in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Baron's mantella frog (Mantella baroni) showing underside in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Baron's mantella frog (Mantella baroni) sitting on leaf in rainforest at 1,200 metres, Ranomafana National Park, Madagascar

Alan Watson / Portrait of Female Giant tree frog (Boophis albilabris) Ranomafana National Park, Madagascar

Alan Watson / Profile portrati of Female Giant tree frog (Boophis albilabris) sitting on tree branch, Ranomafana National Park, Madagascar

Alan Watson / Pandanus (Pandanus sp.) in rainforest at 950 metres, Ranomafana National Park, Madagascar

Alan Watson / Cascades on stream in rainforest at 950 metres, Ranomafana National Park, Madagascar

Alan Watson / Female O'Shaughnessy's chameleon (Calumma oshaughnessyi) on tree branch at 1,200 metres, Ranomafana National Park, Madagascar