Jack Dykinga / Burrowing owl (Athene cunicularia), two huddled together. Marana, Pima County, Arizona, USA.

Guy Edwardes / Pulpit Rock, Isle of Portland, Dorset, England, UK. December 2010.

Wim van den Heever / Quiver Tree forest, (Aloe dichotoma) at dusk. Keetmanshoop, Namibia.

Pete Oxford / Konyak Naga boy peering out of house decorated with buffalo skulls, Konyak Naga headhunting Tribe.Mon district, Nagaland, North East India, October 2014.

Gabriel Rojo / Yatay palm / jelly palm (Batia yatay) trees silhouetted at sunset, El Palmar National Park, Entre Rios Province, Argentina

Juan Carlos Munoz / Quiver tree (Aloe dichotoma) Kokerboom Forest, Nieuwoudtville, Namaqualand, Northern Cape province, South Africa, September 2012.

Shattil & Rozinski / Juvenile American black bear (Ursus americanus), brown phase, standing upright and leaning on a car, Denver, Colorado, USA, July.

Kristel Richard / An Einsiedler / Swiss warmblood mare (Equus caballus) cantering, Schwyz, Switzerland, July.

Petra Wegner / Cavalier King Charles Spaniel, male puppy with tricolor coat , aged 3 months, at garden fence

Jane Burton / Baby Grey Squirrel (Sciurus carolinensis) 'kissing' a tabby kitten.

Mark Carwardine / Hands of a tourist leaning from boat to touch the mouth of a friendly Grey whale (Eschrichtius robustus) lying on the surface, San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Split-level of tourist in small boat leaning out to touch a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Tourists in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) juvenile male 'Mobangi' aged 5 years resting on a tree buttress, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic. Nove...

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) juvenile male 'Mobangi' aged 5 years sitting against a tree buttress, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic....

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) juvenile male 'Mobangi' aged 5 years sitting portrait, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic. December 2011.

Benoit Stichelbaut / Miguel Danet and Damien Cloarec standing on boom, leaning on mainsail of Figaro yacht "Concarneau-St. Barthelemy". Transat AG2R, Port la Foret, Brittany, March 2010.

Nick Turner / Men pulling on a rope in a tug of war competition, Cotswold Olimpicks, Chipping Campden, Gloucestershire, June 2011.

Dan Burton / Children in garden photographing flowers and insects. France, Europe, August. Model released.

Lisa Hoffner / A baby orphan Elephant (Loxodonta africana) leaning against the rump of its friend. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2010.

Bryan and Cherry Alexander / Emperor penguin (Aptenodytes forsteri) chick leaning on parent, Snow Hill Island, Antarctica, October.

Terry Whittaker / 2020VISION / Woman leaning against tree, feeding Grey Squirrel (Sciurus carolinensis) in parkland, Regent's Park, London, UK, April 2011, Model released.

Angelo Gandolfi / Brown Bear (Ursus arctos) cubs, with paws leaning on car window, South Carpathian mountains, Romania

Kristel Richard / A Khampa warrior, mounted on his running Tibetan horse, tries to catch white scarves laid out on the ground, during the horse festival, near Huangyan, in the Garze Tibetan Autonomous Prefecture in the...

Mark Raycroft / Cairn Terrier (Canis familiaris) puppy leaning on logs

ZSSD / African Elephant (Loxodonta africana) calf leaning on its mothers legs, native to Africa

Gavin Hellier / The leaning Tower of Pisa, Campo dei Miracol, Pisa, Tuscany, Italy

Steven David Miller / Eastern grey kangaroo (Macropus giganteus) male scratching stomach, Grampians National Park, Victoria, Australia. December.

Ashley Cooper / A 'Drunken forest' in Fairbanks, Alaska where trees are collapsing into the ground due to global warming induced permafrost melt. Alaska, USA, September 2004

Ashley Cooper / A 'Drunken forest' in Fairbanks, Alaska where trees are collapsing into the ground due to global warming induced permafrost melt. Alaska, USA, September 2004

Ashley Cooper / Electric pylons in Fairbanks, Alaska collapsing into the ground due to global warming induced permafrost melt. Alaska, USA. August 2004

Ashley Cooper / A 'Drunken forest' in Fairbanks, Alaska where trees are collapsing into the ground due to global warming induced permafrost melt. Alaska, USA, September 2004

Ashley Cooper / A 'Drunken forest' in Fairbanks, Alaska where trees are collapsing into the ground due to global warming induced permafrost melt. Alaska, USA, August 2004

Ashley Cooper / Second World War lookout post leaning over eroding cliff near Aldbrough, Yorkshire, England, UK. August 2013.

Ashley Cooper / Second World War pill box on the beach, this was originally on the cliffs above but fell due to coastline erosion. Aldbrough, Yorkshire, England, UK. August 2013.

Ashley Cooper / Second World War lookout post leaning over eroding cliff near Aldbrough, Yorkshire, England, UK. August 2013.

Ashley Cooper / Old house at Recherchefjorden, Van Keulenfjorden, Spitsbergen, Svalbard. It is gradually sliding down slope due to solifluction and permafrost melt. Norway, July 2013.

Ashley Cooper / Old house at Recherchefjorden, Van Keulenfjorden, Spitsbergen, Svalbard. It is gradually sliding down slope due to solifluction and permafrost melt. Norway, July 2013.

Sue Flood / Emperor penguin (Aptenodytes forsteri) adults leaning over young chicks, Gould Bay, Weddell Sea, Antarctica.

Juan Carlos Munoz / Man leaning on scythe, Miera Valley, Valles Pasiegos, Cantabria, Spain. October, 2017.

Lucas Bustamante / Galapagos sea lion (Zalophus wollebaeki) leaning head back, Floreana Island, Galapagos, Endangered species.

Nick Upton / Eurasian beaver (Castor fiber) at night, climbing up the leaning trunk of a tree it has felled to reach a section it has been chewing, Devon Wildlife Trust's Devon Beaver Project enclosure, Devon, Eng...

Steve O. Taylor (GHF) / Juvenile Eastern Lowland gorilla (Gorilla beringei graueri) beating its chest, leaning against a tree and sitting down, Kahuzi-Biega National Park, Democratic Republic of the Congo, 2009.

Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) female 'Linda' leaning out from a tree - wide angle perspective. Pondok Tanggui, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. June 20...

Nick Upton / Deodar cedar tree (Cedrus deodara) blown down in a storm, leaning against a house, Wiltshire UK, March 2016. Property released.

SCOTLAND: The Big Picture / Pine marten (Martes martes) leaning against tree with flowers in foreground, Ardnamurchan, Lochaber, Highland, Scotland, UK, June.

Roger Powell / Blue-winged kookaburra (Dacelo leachii) on branch. Leaning Tree Lagoon, Northern Territory, Australia

Roger Powell / Black-necked stork / Jabiru (Ephippiorhynchus asiaticus) hunting along lakeside, Leaning Tree Lagoon, Northern Territory, Australia

Roger Powell / Red-tailed black cockatoo (Calyptorhynchus banksii) pair resting in the upper branches of a eucalyptus tree. Leaning Tree Lagoon, Northern Territory, Australia.

Roger Powell / Two Red-tailed black cockatoos (Calyptorhynchus banksii) pair resting in a tree. Leaning Tree Lagoon, Northern Territory, Australia.

Roger Powell / Red-tailed black cockatoos (Calyptorhynchus banksii) male landing at a muddy area to feed on minerals in earth, Leaning Tree Lagoon, Northern Territory, Australia.

Roger Powell / Glossy ibis (Plegadis falcinellus)walking past. Leaning Tree Lagoon, Northern Territory, Australia

Carol Walker / Wild mustang family, two mares and two yearlings, leaning playfully on each other, Adobe Town Herd Area, Wyoming, USA. June.

Richard Du Toit / Male Reticulated Giraffe (Giraffa camelopardalis) leaning forward. Ol Pejeta Conservancy, Laikipia County, Kenya.

Richard Du Toit / Two Giraffes (Giraffa camelopardalis) leaning together. Chobe Nationsal Park, Botswana, Africa.

Solvin Zankl / Dr. Rainer Wirth leaning out of tower built to research English oak trees (Quercus robur) Kaiserslautern University of Technology, Germany. October.

Kirkendall-Spring / Cedar tree leaning over Bowman Bay, Fidalgo Island. Washington, USA.

Anup Shah / Dusky Leaf Monkey (Trachypithecus obscurus) juvenile, Khao Sam Roi Yot National Park, Thailand

Olga Kamenskaya / Pine tree (Pinus sp) on Lake Baikal shore in autumn, Siberia, Russia, October 2011.

Steve O. Taylor (GHF) / Portrait of village shopkeeper outside building, rural Chad, 2002-2003.

Markus Varesvuo / Long-tailed duck (Clangula hyemalis) male leaning forward in water, Iceland

RHONDA KLEVANSKY / Three people on pavement including a lady leaning against wall behind bags of recycling and a wheelie bin, Havana, Cuba, October 2011.

Jack Dykinga / Siberian candyflower (Montia parvifolia), Carpet red alder, (Alnus rubra) along Wolf Creek, Sinkyone State Park, Sinkyone Intertribal Wilderness, California, August.

Anup Shah / Japanese Macaque (Macaca fuscata) male resting at the edge of thermal hotspring pool with hand covering face, Jigokudani Yean-Koen National Park, Japan, February.

Jabruson / Hunter with gun near Dead Crowned monkey (Cercopithecus mona pogonias) caught for bush meat trade near Mbomo village, Odzala-Kokoua National Park, Republic of Congo, May 2005.

Mark Raycroft / Pembroke Welsh Corgi (Canis familiaris) puppies

Charlie Summers / Male American kestrel (Falco sparverius) landing at nest box with lizard prey, with a chick leaning out and begging for food, Colorado, USA, July

Charlie Summers / Male American kestrel (Falco sparverius) landing at nest box with grasshopper prey, with a chick leaning out and begging for food, Colorado, USA, July

Charlie Summers / Male American kestrel (Falco sparverius) landing at nest with lizard prey, with a chick leaning out and begging for food, Colorado, USA, July

Eric Baccega / Female Steller sea lion (Eumetopias jubatus) leaning towards an isolated pup hauled out on a rock, with a group of females and juveniles in the sea, Prince Rupert, British Columbia, Canada, June.

Thomas Marent / Beech (Fagus sp) trees, Black Forest, Germany

Thomas Marent / Beech (Fagus sp) trees, Black Forest, Germany

Wild Wonders of Europe / Möllers / Romanian forester sitting in the forest, leaning at a Common beech (Fagus sylvatica) trunk at his shooting stand during a driving hunt for Wild boar (Sus scrofa). Mehadia, Caras Severin, Romania, Octo...

Sergey Gorshkov / Woolly Mammoth (Mammuthus primigenius) tusks leaning against building, Wrangel Island, Russia

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother and 4 month infant resting in tropical forest, Western Uganda

Mark Carwardine / Hands of a tourist leaning from boat to touch the skin of a friendly Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Hands of a tourist leaning from boat to touch the mouth of a friendly Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Hands of a tourist leaning from boat to touch the mouth of a friendly Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Tourist in small boat leaning out to touch a Grey whale (Eschrichtius robustus) with mouth open and baleen exposed, San Ignacio Lagoon, Baja California, Mexico, model released, April 2009

Mark Carwardine / Tourist in small boat leaning out to touch a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, no model release

Mark Carwardine / Tourists in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, February 2009

Mark Carwardine / Tourists in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, February 2009

Mark Carwardine / Tourists in small boat leaning out to touch a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, February 2009

Mark Carwardine / Tourist in small boat leaning out to kiss a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, February 2009

Mark Carwardine / Tourists in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Mark Carwardine / Tourists in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Mark Carwardine / Tourists in small boat leaning out to photograph a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Mark Carwardine / Tourists in small boat leaning out to touch a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Mark Carwardine / Tourists in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Mark Carwardine / Tourist in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Mark Carwardine / Tourists in small boat leaning out to touch a curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, March 2007

Mark Carwardine / Tourist in small boat leaning out to touch curious Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, February 2006

Mark Taylor / Hawthorn (Crataegus monogyna) showing influence of prevailing wind on its shape, Sussex, UK

Eric Medard / Common buzzard (Buteo buteo) eating dead Copyu / Nutria in winter, leaning forward and defecating, France, February