Peter Cairns / 2020VISION / View up through canopy of Silver birches (Betula pendula) in winter, Insh Marshes, Cairngorms NP, Highlands, Scotland, UK, December. Photographer quote: "Fingers and toes might protest at -15c, but on...

Jouan & Rius / View up through Palm trees in swamp forest, Borneo, Sarawak, Malaysia

Ernie Janes / Beech trees at Felbrigg Great Wood, Norfolk, UK, November 2008

Alex Hyde / Lowland rainforest viewed from canopy platform, Masoala Peninsula National Park, north east Madagascar, October 2009

Steven David Miller / Subtropical rainforest growing in a creek gully, while at higher levels a mixed forest begins. Fraser Island, Queensland, Australia

Tim Laman / Epiphytic orchid (Bulbophyllum medusae) growing in the canopy of the lowland rainforest, Gunung Palung National Park, Borneo, West Kalimantan, Indonesia

Tim Laman / Strangler Fig (Ficus sp.) that has killed its host tree long ago. The host has rotted away, leaving a hollow center. Lowland rainforest in Borneo. Gunung Palung National Park, Indonesia.

Neil Lucas / Giant bamboo (Cathariostachys) view up into canopy from the forest floor, Kyoto, Japan, February 2008

Neil Lucas / Ancient Oak tree (Quercus) Savernake Forest, Wiltshire, UK

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.

Inaki Relanzon / Looking up into European Beech (Fagus sylvatica)tree canopy in autumm colours. Ordesa y Monte Perdido National Park, Pyrenees, Aragon, Spain. October 2009