Juan Carlos Munoz / Log piles in alcove outside farm building, Triglav National Park, Trenta Valley, Julian Alps, Bovec, Slovenia, October 2014.
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Juergen Freund / Richard Fitzpatrick releases Grey reef shark {Carcharhinus amblyrhynchos} after inserting transmitter into its belly, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008
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Juan Carlos Munoz / Gomantong caves with ladder for collecting Swiftlet nests, River Sungai Kinabatangan, Sabah, Borneo, Malaysia 2007
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Juan Carlos Munoz / People climbing up ladder at Balcony House, Mesa Verde National Park UNESCO World Heritage Site, Colorado, USA. October.
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Marie Lochman / Dave Evans Bicentennial Tree, a tourist attraction with ladder climbing up the tree to look out tower. Warren National Park, Western Australia, January 2012
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Marie Lochman / Dave Evans Bicentennial Tree, a tourist attraction with ladder climbing up the tree to look out tower. Warren National Park, Western Australia, January 2012
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Marie Lochman / Dave Evans Bicentennial Tree, a tourist attraction with ladder climbing up the tree to look out tower. Warren National Park, Western Australia, January 2012
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Marie Lochman / Dave Evans Bicentennial Tree, a tourist attraction with ladder climbing up the tree to look out tower. Warren National Park, Western Australia, January 2012
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Nick Upton / Researcher using laptop to check trailcam footage of Siberian flying squirrel (Pteromys volans) nest box in mature mixed forest. Near Lisaku, Estonia. April 2018. Model released.
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Nick Upton / Researchers carrying equipment prior to fitting nest box for Siberian flying squirrel (Pteromys volans). Mature mixed forest, Estonia. April 2018. Model released.
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Nick Upton / Researchers fitting Siberian flying squirrel (Pteromys volans) nest box to tree. Mature mixed forest, Estonia. April 2018. Model released.
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Nick Upton / Researchers fitting Siberian flying squirrel (Pteromys volans) nest box to mature tree and recording position on GPS unit. Estonia. April 2018. Model released.