Peter Cairns / 2020VISION / Fishing boat silhouetted at sunset, The Minch, a stretch of water between NW Highlands and the Inner Hebrides, Scotland, UK, May 2010

Peter Cairns / 2020VISION / Silhouette of Rock ptarmigan (Lagopus mutus) perched on rock against winter sun, Cairngorms NP, Highlands, Scotland, UK, February. Photographer quote: 'At -20c and with fog rolling across the mountain...

Alex Hyde / Ogre faced / Net-casting spider {Deinopis sp} with web held between legs that it will stretch over prey that walks below it. Masoala Peninsula National Park, north east Madagascar.

Alex Hyde / Ogre faced / Net-casting spider {Deinopis sp} with web held between legs that it will stretch over prey that walks below it. Masoala Peninsula National Park, north east Madagascar.

Christophe Courteau / African wild dogs (Lycaon pictus) relaxing beside waterhole, one stretching. Okavango Delta during the dry season, Botswana

Jack Dykinga / The sunrise glow on the Colorado River in the Grand Canyon at a stretch of river know as Conquistador Aisle. Grand Canyon National Park, Arizona. May 2012.

Jack Dykinga / The sunrise glow on the Colorado River in the Grand Canyon at a stretch of river know as Conquistador Aisle. Grand Canyon National Park, Arizona. May 2012.

LYNN M. STONE / Trumpeter Swan (Cygnus buccinator) landing on open stretch of St. Croix River in dwan light. Wisconsin, USA, February.

LYNN M. STONE / Trumpeter swans (Cygnus buccinator) on open stretch of river in sub zero temperatures, Wisconsin, USA, February

LYNN M. STONE / Trumpeter swans (Cygnus buccinator) on open stretch of river in sub zero temperatures, Wisconsin, USA, February

Peter Cairns / 2020VISION / Coastal landscape, Port Nis, Isle of Lewis, Western Isles / Outer Hebrides, Scotland, UK, May 2011. Did you know? The Isle of Lewis is the most northerly of the Western Isles, a chain of islands that...

Fiona Rogers / Bonobo (Pan paniscus) female wading across a stretch of water carrying her baby aged 12-14 months on her back (Pan paniscus). Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.

Fiona Rogers / Bonobo (Pan paniscus) female wading across a stretch of water carrying her baby aged 12-14 months on her back, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.

Peter Cairns / 2020VISION / Fishing boat silhouetted at sunset, The Minch, a stretch of water between NW Highlands and the Inner Hebrides, Scotland, UK, May 2010

Charlie Summers / Bighorn sheep (Ovis canadensis) ram in low stretch position, Montana, USA

Tim Laman / Semi-permanent fishermans camp at Tanjung Besi, Gam Island. These outsiders from Buton Island, Sulawesi, come here for months at a stretch to fish at night for small fish. Men prepare to take their b...

Tim Laman / Semi-permanent fishermans camp at Tanjung Besi, Gam Island. These outsiders from Buton Island, Sulawesi, come here for months at a stretch to fish at night for small fish. This view is inside one of...

Nick Upton / Long-jawed Orbweaver / Stretch Spider (Tetragnatha montana) on leaf. Wiltshire garden, UK, May.

Alex Hyde / Ogre faced / Net-casting spider {Deinopis sp} at night with web held between legs ready to stretch over invertebrate prey. Lowland rainforest, Masoala Peninsula National Park, north east Madagascar.

Bruno D'Amicis / Barn swallow (Hirundo rustica) pushed back by strong wind and high waves while trying to cross a stretch of sea during spring migration. Morocco, NW Africa

Jerry Monkman / An unmistakable white blaze marks the Appalachian Trail along this stretch of the Ethan Pond trail in the White Mountains, New Hampshire, USA.

Doug Perrine / White tentacles of Spaghetti / Medusa worm {Terebellidae} stretch across yellow sponge to feed, Dominica, Caribbean

Mitsuaki Iwago / Qinling Mountains stretch over the Sichuan and Shaanxi provinces, they are a habitat for the Giant Panda, China

George Chan / Man-made underground water channels, called Karez, stretch for thousands of kilometres through China's deserts, bringing water from distant mountains to desert towns like Turpan City, Xinjiang Provinc...

George Chan / Man-made underground water channels, called Karez, stretch for thousands of kilometres through China's deserts, bringing water from distant mountains to desert towns like Turpan City, Xinjiang Provinc...

George Chan / Underground water channels, called Karez, near Turpan city in Xinjiang Province, North-west China. These channels stretch for thousands of kilometres underneath China's deserts, bringing water from di...

Richard Du Toit / Ostrich (Struthio camelus) walking as their shadows stretch across the sand, South Africa

Jean E. Roche / Aerial view of the first kilometre stretch of the Rhone river, Switzerland

Jean E. Roche / The Gletsch mountain pass and the first kilometre stretch of the Rhone river, Switzerland

Jane Burton / Domestic Cat {Felis catus} 5-month Silver spotted shorthair male 'Arum', jumping at lure, full stretch, back hollow.

Jane Burton / Domestic Cat {Felis catus} 5-month Silver spotted shorthair male 'Arum', jumping at full stretch, back hollow.

Eric Baccega / Polar bear stretching {Ursus maritimus} Churchill, Manitoba

Thomas Lazar / Great blue heron pair stretch display, Florida, USA

Rick Tomlinson / Calm waters stretch to the distant mountains, Lofoten Islands, Norway.

Chris Shields / Illustration of female Common stretch-spider / slender orb web spider (Tetragnatha extensa), Tetragnathidae.

Aflo / ic-04107 Labrador dog running through shallow water on beach.

Heidi & Hans-Juergen Koch / Honey Bee (Apis mellifera) taped to husks to be conditioned to out-stretch tongue, Bee Station at the Bavarian Julius-Maximilians-University of Wurzburg, Germany

Erwan Quéméré / Boats leaving Glen Coe for the next stretch of the Great Glen Raid. ^^^Rowing in the narrow stretches and sailing through the lochs, the Great Glen Raid competitors cross Scotland along the Caledonian...