Morley Read / Reventador Volcano erupting at night, red hot boulders ejected from crater rolling down slopes. Rio Quijos Valley, Amazonian Andes, Ecuador. November 2015. Digitally stitched image.

Sylvain Cordier / Golden snub-nosed monkey (Rhinopithecus roxellana),standing up on river boulders, Qinling Mountains, Shaanxi province, China

Jack Dykinga / Backlit silver cholla cactus (Cylindropuntia echinocarpa) surrounded by California poppies (Eschscholzia californica), beneath the eroded boulders that define the park. Joshua Tree National Park, Moja...

Guy Edwardes / Calm sea with St Mary's Lighthouse in distance, Whitley Bay, Tyne and Wear, England, UK, February 2008.

Guy Edwardes / Seaweed covered rocks with Gaada Stack in background, Foula, Shetland, Scotland, UK. August, 2016.

Jack Dykinga / Storm clouds at sunset over balancing eroded boulder, Texas Canyon, Little Dragoon Mountains, Chihuahuan Desert, Arizona, USA. September.

Jack Dykinga / Indian paintbrush (Castilleja sp.) flowers amid boulders in a stream, in narrow canyon with conifers in background Grand Staircase-Escalante National Monument, Utah, USA.

Jack Dykinga / Granite Boulders in canyon, Little Dragoon Mountains in background in sunset light, Texas, USA, August.

Neil Aldridge / African penguins (Spheniscus demersus) preening themselves on rocks at the Boulders Beach colony near Cape Town, South Africa.

Juergen Freund / Dingo (Canis lupus dingo) at Devils Marbles, Northern Territory, Australia.

Christophe Courteau / Storm at 'Pointe de Pern', Ile d'Ouessant / Ushant. Nividic lighthouse visible in distance. Finistere, Brittany, France, September 2011.

Bruno D'Amicis / Apennine chamois (Rupicapra pyrenaica ornata) adult male in snowy mountain habitat. Endemic to the Apennine mountains. Abruzzo, Italy, November.

Steven David Miller / Devils Marbles, Devils Marbles Conservation Reserve, Northern Territory, Australia, June 2010

Graham Eaton / Jackass / African / Blackfooted penguin (Spheniscus demersus) endemic to South Africa, November, playing in the sea, Boulders Beach near Cape Town, South Africa, November

Andy Trowbridge / Moeraki Boulder / Kaihinaki, on Koekohe Beach. 60 Million year old mudstone concretions. Moeraki, Waitaki District, Otago Region, South Island, New Zealand. January, 2012. Taken with Blue-n-Gold Polar...

Joe Cornish / 2020VISION / Looking west from the upper slopes of Cul Mor, Coigach / Assynt SWT, Sutherland, Highlands, Scotland, UK, June 2011

Peter Cairns / 2020VISION / View towards Cuillin range from Elgol Beach, Skye, Inner Hebrides, Scotland, UK, october 2010

Peter Cairns / 2020VISION / Rock ptarmigan (Lagopus mutus) tracks in snow, with low winter sun, Lochain Mountain, Cairngorms NP, Highlands, Scotland, UK, February 2010. 2020VISION Book Plate.

Alex Mustard / An Ornate / Banded Wobbegong Shark (Orectolobus ornatus) lies amongst boulders inside a cave, during the day. Fish Rock, Southwest Rocks, New South Wales, Australia. Pacific Ocean. November

Nick Upton / Distant sailing-boat viewed though weather sculpted granite boulders. Campomoro point, Corsica, France, June 2010.

Graham Eaton / Underwater view of River Glaslyn rapids, Beddgelert, Snowdonia NP, Wales, April 2010.

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

Jerry Monkman / Man bouldering in "The Boulders" section of Pawtuckaway State Park, New Hampshire, USA, September 2008. Model released.

Alex Hyde / Derwent Edge after rainstorm, with gritstone boulders in foreground. Peak District National Park, England. March 2008.

Jack Dykinga / Weathered and eroded monzogranite boulders with dikes on crystalline intrusions, sunset, Joshua Tree National Park, Mojave Desert, California, USA

Jack Dykinga / Weathered and eroded monzogranite boulders balanced precariously, sunset, Joshua Tree National Park, Mojave Desert, California, USA

Alex Hyde / Heavy snowfall covering gritstone boulders, Derwent Edge, Peak District National Park, Derbyshire, UK. February 2009

Jouan & Rius / Ghost Gum (Eucalyptus / Corymbia papuana) growing amongst granite boulders of Devils Marbles, Karlu Karlu Conservation Reserve, Northern Territory, Australia

Inaki Relanzon / Black footed / Jackass penguins {Spheniscus demersus} walking along road at night with street lights, Boulders, South Africa

Solvin Zankl / Blackfooted / jackass penguin (Spheniscus demersus) Boulders beach, South Africa

Kirkendall-Spring / Misty cobblestone beach at Thornhill State Beach, California, USA

Jack Dykinga / Boulders with trails across a dry lake bed, sunrise, The Racetrack Playa, Death Valley National Park, California

Luiz Claudio Marigo / Black footed penguin at nest hollow {Spheniscus demersus} Boulders Bay, South Africa

Luiz Claudio Marigo / Black footed penguins on beach {Spheniscus demersus} Boulders Bay, South Africa

Jose B. Ruiz / White storks {Ciconia ciconia} at nest at night. Los Berruecos NP, Extremadura. Spain. Nesting on granite boulders to keep themselves safe from mammal predators. Winner of Innovation Award in Wildlife...

Gavin Hellier / Jackass penguins {Speniscus demersus} on beach Boulders Beach, Cape Town, South Africa

Gavin Hellier / Anse Source d'Argent Beach, La Digue Island Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach with granite boulders, La Digue Island Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach with granite boulders, La Digue Island, Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach, La Digue Island, Seychelles, Indian Ocean

John Downer / Black footed / Jackass penguins on beach {Speniscus demersus} Boulders Beach, South Africa

John Downer / Black footed / Jackass penguins on beach {Speniscus demersus} Boulders Beach, South Africa

Tony Heald / Black fronted penguins {Spheniscus demersus} Boulders Beach, South Africa Jackass male

Doug Wechsler / Joshua Tree (Yucca brevifolia) NM, California, USA Granite Boulders.

Tim Fitzharris / Joshua Tree (Yucca brevifolia) group and boulders, Joshua Tree National Park, California

Kevin Schafer / Black-footed Penguin (Spheniscus demersus) group walking near huge stones, Boulders Beach, Cape Peninsula, South Africa

Luciano Candisani / Black-footed Penguin (Spheniscus demersus) group on rocks, Boulders Beach, South Africa

Colin Monteath / Ice boulders on Ridley Beach, Cape Adare, Ross Sea, Antarctica