Doug Allan / Crossing a crevasse ladder in the Khumbu Icefall on Mount Everest Nepal. Model released. Freeze Frame book plate page 143.

Juan Carlos Munoz / Log piles in alcove outside farm building, Triglav National Park, Trenta Valley, Julian Alps, Bovec, Slovenia, October 2014.

Alex Hyde / Jacob's Ladder (Polemonium caeruleum) flowering. Lathkill Dale NNR, Peak District National Park, UK, June.

Ole Jorgen Liodden / Boreal Jacobs-ladder (Polemonium boreale) in front dark mountains. Spitsbergen, Svalbard, July.

Neil Lucas / Camerman Doug Allan at frozen water surface of drilled ice hole, BBC film crew, McMurdo Sound, Ross Sea, Antarctica, November 2008

Martin Gabriel / Woody / Monkey ladder vine (Bauhinia glabra) Palo Verde National Park, Costa Rica

Martin Gabriel / Woody / Monkey ladder vine (Bauhinia glabra) Palo Verde National Park, Costa Rica

Wild Wonders of Europe / Liodden / Boreal jacobs ladder (Polemonium boreale) flowers, Spitsbergen, Svalbard, Norway, June 2009

Wild Wonders of Europe / Oxford / Ladder snake (Elaphe scalaris) on rock, Sierra de Andújar Natural Park, Mediterranean woodland of Sierra Morena, north east Jaén Province, Andalusia, Spain, April 2009

Wild Wonders of Europe / Cairns / Photographer Peter Cairns climbing ladder to photograph Great grey owl (Strix nebulosa) in boreal forest, Northern Oulu, Finland, June 2008

Juan Carlos Munoz / Gomantong caves with ladder for collecting Swiftlet nests, River Sungai Kinabatangan, Sabah, Borneo, Malaysia 2007

Geoff Scott-Simpson / Jacob's ladder {Polymonium caeruleum} UK Lathkill Dale NNR, Derbyshire dales

Geoff Scott-Simpson / Jacob's ladder flower {Polymonium caeruleum} Lathkill Dale NNR, Derbyshire dales UK

Geoff Scott-Simpson / Jacobs ladder flower - pink form {Polemonium caeruleum}. Peak District, Derbyshire, UK

Jose B. Ruiz / Ladder snake shed skin (Elaphe scalaris) Alicante, Spain

Alan Murphy/ BIA / Ladder-backed Woodpecker (Picoides scalaris) male, Arizona

Rolf Nussbaumer / Ladder-backed woodpecker (Picoides scalaris) male feeding amongst blossoming Eastern redbud (Cercis canadensis). Hill Country, Texas, USA.

Rolf Nussbaumer / Ladder-backed woodpecker (Picoides scalaris) male perched on blossoming Mexican plum (Prunus mexicana). Hill Country, Texas, USA.

Rolf Nussbaumer / Ladder-backed woodpecker (Picoides scalaris) male perched on blossoming Peach (Prunus persica) branch. Hill Country, Texas, USA.

Rolf Nussbaumer / Ladder-backed woodpecker (Picoides scalaris) male perched amongst Peach (Prunus persica) blossom. Hill Country, Texas, USA.

Edwin Giesbers / Father and son, Fred and Henk-Jan Koning blocking hole of Tawny owl (Strix aluco) nest box before ringing and weighing birds. Part of 60 year long-term study to monitor raptor nests in a 3,400 hectare...

Edwin Giesbers / Henk-Jan Koning climbing ladder to ring birds in nest hole while his dad Fred Koning blocks the hole with a jumper to stop the birds escaping. Part of 60 year long-term study to monitor raptor nests i...

Edwin Giesbers / Bird ringer Fred Koning holding Tawny owl (Strix aluco) during ringing session. Part of 60 year long-term study to monitor raptor nests in a 3,400 hectare area of coastal dunes. Near Amsterdam, The Ne...

Paul Harcourt Davies / Jacob's ladder (Polemonium caeruleum), white form. Dolomites, Italy. June.

Paul Harcourt Davies / Jacob's ladder (Polemonium caeruleum), white form. Dolomites, Italy. June.

Enrique Lopez-Tapia / Traditional clay barn with wooden ladder propped against it. Taneka community, Benin, 2020.

Alan Williams / Salmon ladder next to the weir on the River (Afon) Ogwen at Ogwen Bank near Bethesda North Wales UK, October 2019.

Alan Williams / Salmon ladder on left next to the weir on the River (Afon) Ogwen at Ogwen Bank near Bethesda North Wales, UK, October 2019.

Guy Edwardes / The coastline at Sidmouth looking east from Jacob's Ladder towards High Peak, Jurassic Coast World Heritage Site, Sidmouth, Devon, England, November 2009

Klein & Hubert / Dwarf Cochin hen on ladder near Hydragea flowers in summerm France.

Wendy Shattil / Ladder-backed woodpecker (Dryobates scalaris) in the hand, biologist measuring size of leg during bird ringing. Southmost Preserve, The Nature Conservancy reserve, Brownsville, Texas, USA. July 2019.

Klein & Hubert / Tabby and white kitten,age two and a half months lying on a miller's ladder in a farmyard

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

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

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

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

Marie Read / Equipment set up for remote control photography at nest hole of Great Crested Flycatcher (Myiarchus crinitus), New York, USA. Camera, fitted with wide angle lens, mounted on monopod attached to ladder...

Juan Carlos Munoz / People climbing up ladder at Balcony House, Mesa Verde National Park UNESCO World Heritage Site, Colorado, USA. October.

Juan Carlos Munoz / Person climbing ladder built into the rocks of Via Ferrata, El Caliz, Cantabria, Spain, November 2018.

Juan Carlos Munoz / Cliffs with people climbing ladder at the Via Ferrata in the distance, El Caliz, Cantabria, Spain, November 2018.

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.

Nick Upton / Researchers carrying equipment prior to fitting nest box for Siberian flying squirrel (Pteromys volans). Mature mixed forest, Estonia. April 2018. Model released.

Nick Upton / Researchers carrying ladder and nest boxes for Siberian flying squirrel (Pteromys volans). Mature mixed forest, Estonia. April 2018. Model released.

Nick Upton / Researchers fitting Siberian flying squirrel (Pteromys volans) nest box to tree. Mature mixed forest, Estonia. April 2018. Model released.

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.

Franco Banfi / Scouting the river on a small boat driven by an electric motor in search of Anacondas, Formoso River, Bonito, Mato Grosso do Sul, Brazil

David Fleetham / Galapagos tortoise (Geochelone nigra) resting for night below a tree house. Tortoise Farm, Santa Cruz Island, Galapagos. July 2009.

Klein & Hubert / Tabby and white kitten, age two months, sitting on an old miller's ladder in a farmyard