Chris Mattison / Mullein moth (Cucullia verbasci) on leaf. Wye Valley, Monmouthshire, Wales, UK. May.

Pete Oxford / Canopy Walkway, 275m long, 36m high rigid walkway, at Sacha Lodge. Napo River bordering Yasuni National Park, Amazon Rainforest Ecuador.

Tim Laman / Young boy aged 7 (model released) exploring a canopy rope bridge walkway through the lowland dipterocarp rainforest in Borneo. Danum Valley Conservation Area, Sabah, Malaysia, July 2007

Tim Laman / Young brother and sister (both model released) exploring a canopy rope bridge walkway through the lowland dipterocarp rainforest in Borneo. Danum Valley Conservation Area, Sabah, Malaysia, July 2007

Tim Laman / A young boy (model released) aged 9, crossing a fallen tree bridge with a hand rope that spans the river, at the research station in Gunung Palung NP. Borneo. July 2007

Roland Seitre / Peter's Angola Colobus Monkeys (Colobus angolensis palliatus) in canopy, with a rope bridge between trees to allow the monkeys to cross a road safely. Kenya, Africa.

Jeff Wilson / Transporting camera equipment across rope bridge, whilst on location filming migrating Demoiselle Cranes (Anthropoides virgo) in the Kali Gandaki Valley, Nepal, for BBC Planet Earth series, 2005

Gavin Maxwell / Rope bridge adorned with prayer flags, Yarlung Gorge, Tibet, May 07. 'Wild China' series Note - World's deepest gorge

DAVID TIPLING / Carrick-a-Rede rope bridge at County Antrim coast, Northern Ireland, UK

DAVID TIPLING / Carrick-a-Rede rope bridge at County Antrim coast, Northern Ireland, UK

Gavin Maxwell / Rope bridge across Yarlung gorge, Tibet, May 07. 'Wild China' series