Cyril Ruoso / Chimpanzee (Pan troglodytes) using tools to crack nuts, Gabon

Cyril Ruoso / Chimpanzee (Pan troglodytes) using tools to crack nuts, Gabon

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010.

David Woodfall / Aerial view of pancake ice sheet cracking and melting in Hudson Bay, Manitoba, Canada, December 2004

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rocks to crack nuts, Piaui, Brazil

Mary McDonald / Black striped capuchin (Sapajus libidinosus) using rocks to crack nuts, Piaui, Brazil

Mary McDonald / Brown Capuchin (Cebus apella) using rocks to crack nuts, Piaui, Brazil

Bryan and Cherry Alexander / Inuk cracking his whip to encourage Huskies (Canis familiaris) over the sea ice. Igloolik, Nunavut, Canada, 1993.

TJ Rich / Blue iceberg with visible crack, Antarctica

Pete Oxford / Brown Capuchin (Cebus apella) stabilizes itself with its prehensile tail while using a heavy rock hammer to crack open palm nuts placed in small pits in the anvil rock surface, Cerrado habitat, Brazil

Pete Oxford / Brown Capuchin (Cebus apella) stabilizes itself with its prehensile tail while using a heavy rock hammer to crack open palm nuts placed in small pits in the anvil rock surface, Cerrado habitat, Brazil

Mark Moffett / Large Ground Finch (Geospiza magnirostris) endemic species, extra large bill for cracking large seeds, largest of Darwin's 13 Finches, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Brown Capuchin (Cebus apella) pair using rock and anvil to crack open Piassava Palm (Attalea funifera) nuts, Cerrado habitat, Piaui State, Brazil

Pete Oxford / Brown Capuchin (Cebus apella) using a rock to crack open a Piassava Palm (Attalea funifera) nut, Cerrado habitat, Piaui State, Brazil

Pete Oxford / Brown Capuchin (Cebus apella) using a rock to crack open a Piassava Palm (Attalea funifera) nut, Cerrado habitat, Piaui State, Brazil

Pete Oxford / Hyacinth Macaw (Anodorhynchus hyacinthinus) cracking open a Piassava Palm (Attalea funifera) nut to drink the milk, Brazil

Michael W. Richards / Chimpanzee troupe nut cracking in rainforest clearing (Pan troglodytes) Tai Forest, Ivory Coast, Africa

Nigel Cattlin / Doyenne du Comice pear (Pyrus communis) fruit with deformity caused by Pear stony pit virus. Berkshire, England, UK.

Ashley Cooper / The Ineos oil refinery at Grangemouth in the Firth of Forth, Scotland, UK. It is Scotlands only oil refinery

Ashley Cooper / The Ineos oil refinery at Grangemouth in the Firth of Forth, Scotland, UK. October 2010.

Ashley Cooper / The Ineos oil refinery at Grangemouth in the Firth of Forth, Scotland, UK. October 2010.

Ashley Cooper / Flaring off gas at The Ineos oil refinery at Grangemouth in the Firth of Forth, Scotland, UK. October 2010.

Ashley Cooper / Flaring off gas at The Ineos oil refinery at Grangemouth in the Firth of Forth, Scotland, UK. October 2010.

Matthew Maran / Red cracking bolete fungus (Boletus chrysenteron) pulled out from the ground, Hampstead Heath, London, England, UK. October.

Staffan Widstrand / Seasonal marshlands which had dried up, Pulicat Lake, Tamil Nadu, India, January 2013.

Suzi Eszterhas / Ring-tailed Lemur (Lemur catta) mother cracking open seed pod, Berenty Private Reserve, Madagascar

Cyril Ruoso / Olive Baboon (Papio anubis) cracking palm nuts with teeth, Gombe National Park, Tanzania

Cyril Ruoso / Chimpanzee (Pan troglodytes) using two rocks as tools to crack a nut, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) using two rocks as tools to crack a nut, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) using two rocks as tools to crack a nut, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) using tools to crack nuts, Gabon

Cyril Ruoso / Bonobo (Pan paniscus) using rocks as a hammer and anvil to crack open nuts, ABC Sanctuary, Democratic Republic of the Congo

Cyril Ruoso / Bonobo (Pan paniscus) using rocks as a hammer and anvil to crack open nuts, ABC Sanctuary, Democratic Republic of the Congo

Cyril Ruoso / Bonobo (Pan paniscus) using rocks as a hammer and anvil to crack open nuts, ABC Sanctuary, Democratic Republic of the Congo

Cyril Ruoso / Bonobo (Pan paniscus) using rocks as a hammer and anvil to crack open nuts, ABC Sanctuary, Democratic Republic of the Congo

Fiona Rogers / Alpha male Western chimpanzee (Pan troglodytes verus) 'Foaf', aged 30 years, cracking open oil palm nuts on stones, with female 'Fanle', aged 13 years, and infant aged 3 years, Bossou Forest, Mont Nim...

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010.

Anup Shah / Western chimpanzee (Pan troglodytes verus) young male 'Peley' aged 12 years sitting holding nut cracking stone, Bossou Forest, Mont Nimba, Guinea. January 2011.

Anup Shah / Western chimpanzee (Pan troglodytes verus) females 'Jire' aged 52 years and 'Fanle' aged 13 years with suckling infant male 'Flanle' aged 3 years using rocks as tools to crack open palm oil nuts, Bo...

Anup Shah / Western chimpanzee (Pan troglodytes verus) females 'Jire' aged 52 years and 'Fanle' aged 13 years with suckling infant male 'Flanle' aged 3 years using rocks as tools to crack open palm oil nuts, Bo...

Anup Shah / Western chimpanzee (Pan troglodytes verus) females 'Jire' aged 52 years and 'Fanle' aged 13 years with suckling infant male 'Flanle' aged 3 years using rocks as tools to crack open palm oil nuts, Bo...

Anup Shah / Western chimpanzee (Pan troglodytes verus) females 'Jire' aged 52 years and 'Fanle' aged 13 years using rocks as tools to crack open palm oil nuts watched closely by infant male 'Flanle' aged 3 year...

Anup Shah / Western chimpanzee (Pan troglodytes verus) young male 'Jeje' aged 13 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Velu' aged 51 years using two rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Velu' aged 51 years using two rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Velu' aged 51 years using two rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011.

Anup Shah / Western chimpanzee (Pan troglodytes verus) infant male 'Flanle' aged 3 years playing while his mother 'Fanle' aged 13 years cracks palm oil nuts using rocks as tools, Bossou Forest, Mont Nimba, Guin...

Anup Shah / Western chimpanzee (Pan troglodytes verus) young male 'Peley' aged 12 years, female 'Fanle' aged 13 years and her infant son 'Flanle' aged 3 years using rocks as tools to crack open palm oil nuts, B...

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Fanle' aged 13 years in estrus but still carrying her infant son 'Flanle' aged 3 years on her back watching male 'Tua' cracking palm oil nuts, Boss...

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Jire' aged 52 years using two rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Jire' aged 52 years using two rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Jire' aged 52 years using two rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Velu' aged 51 years watching another female 'Jire' aged 52 years intently as she using rock to crack open palm oil nuts, Bossou Forest, Mont Nimba,...

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Yo' aged 49 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Fanle' aged 13 years with her infant son 'Flanle' aged 3 years on her back sitting with alpha male 'Foaf' aged 30 years who is cracking open palm o...

Anup Shah / Western chimpanzee (Pan troglodytes verus) infant male 'Flanle' aged 3 years trying to suckle from his mother 'Fanle' aged 13 years while she tries to crack nuts, Bossou Forest, Mont Nimba, Guinea....

Anup Shah / Western chimpanzee (Pan troglodytes verus) infant male 'Flanle' aged 3 years playing with juvenile female 'Joya' aged 6 years while young male 'Jeje' aged 13 years sits cracking nuts in the backgrou...

Anup Shah / Western chimpanzee (Pan troglodytes verus) infant male 'Flanle' aged 3 years playing while his mother 'Fanle' aged 13 years uses rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba...

Anup Shah / Western chimpanzee (Pan troglodytes verus) infant male 'Flanle' aged 3 years wearing on his head a 'head support' used by villagers to carry heavy items made from palm leaves, whilst his mother usin...

Anup Shah / Western chimpanzee (Pan troglodytes verus) male 'Tua' aged 53 years grooming young male 'Jeje' aged 13 years while he cracks palm oil nuts using rocks as tools, Bossou Forest, Mont Nimba, Guinea. De...

Anup Shah / Western chimpanzee (Pan troglodytes verus) male 'Tua' aged 53 years grooming young male 'Jeje' aged 13 years while he cracks palm oil nuts using rocks as tools, Bossou Forest, Mont Nimba, Guinea. De...

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Jire' aged 52 years carrying two rocks in her hands that she will then use as tools for cracking palm oil nuts, Bossou Forest, Mont Nimba, Guinea....

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010. Sequence 3 of 3.

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010. Sequence 2 of 3.

Anup Shah / Western chimpanzee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. December 2010. Sequence 1 of 3.

Fiona Rogers / Western chimpazee (Pan troglodytes verus) female 'Fana' aged 54 years showing her infant grandson 'Flanle' aged 3 years how to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011...

Fiona Rogers / Western chimpazee (Pan troglodytes verus) juvenile female 'Joya' aged 6 years using rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011.

Fiona Rogers / Western chimpazee (Pan troglodytes verus) female 'Fanle' aged 13 years using two rocks as tools to crack open palm oil nuts, Bossou Forest, Mont Nimba, Guinea. January 2011.

Fiona Rogers / Western chimpazee (Pan troglodytes verus) infant male 'Flanle' aged 3 years sitting with his mother 'Fanle' aged 13 years while she is cracking palm oil nuts using rocks as tools, Bossou Forest, Mont...

Tui De Roy / Large cactus finch (Geospiza conirostris), cracking open spiny armored Trebulus seeds. Espanola Island, Galapagos Islands, Ecuador, May.

Eric Baccega / Cracks in the pack ice, Manson Icefield peninsula and Jakeman glacier, Ellesmere Island, Nunavut, Canada, June 2012.

Guy Edwardes / 2020VISION / Pores on underside of cap of Red cracking Bolete fungus (Boletus chrysenteron) Bolderwood, New Forest National Park, Hampshire, England, UK, November.

Guy Edwardes / 2020VISION / Pores on underside of cap of Red cracking Bolete fungus (Boletus chrysenteron) Bolderwood, New Forest National Park, Hampshire, England, UK, November.

Guy Edwardes / 2020VISION / Red cracking bolete fungus (Boletus chrysenteron). New Forest National Park, Hampshire, England, UK, November.

Roy Mangersnes / Fjord ice cracking open, Sabine Bay on Nordaustlandet, Svalbard, Norway, August

MYN / Paul Harcourt Davies / Two-tailed pasha butterfly (Charaxes jasius) pupal case cracking, emergence sequence 5/24, Italy, August. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Two-tailed pasha butterfly (Charaxes jasius) pupal case cracking, emergence sequence 3/24, Italy, August. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Two-tailed pasha butterfly (Charaxes jasius) pupal case cracking and butterfly emerging, emergence sequence 6/24, Italy, August. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Two-tailed pasha butterfly (Charaxes jasius) pupal case cracking, emergence sequence 4/24, Italy, August. meetyourneighbours.net project

Lassi Rautiainen / Ice cracking and melting in woodland revealing earth and plants underneath, Finland, April 2010

Thomas Lazar / Close-up of petrified rock log chips on dried and cracking crust, Petrified Forest National Park, Arizona, USA, March 2008

David Woodfall / Dry saltmarsh pan with cracking after drought Bridgewater Bay NNR Severn Estuary Somerset, England, August 2009

David Woodfall / Dry saltmarsh pan with cracking after drought Bridgewater Bay NNR Severn Estuary Somerset, England, August 2009

Justine Evans / Adolescent male Chimpanzee (Pan troglodytes) cracking nuts using rock hammer and anvil tools, "Pele" from study group in Bossou, Guinea

Tim Laman / Black Hornbill (Anthracoceros malayanus) male cracking the husk in its beak to feed on Aglaia fruit. Gunung Palung National Park, West Kalimantan, Borneo, Indonesia

Tim Laman / Black Hornbill (Anthracoceros malayanus) male cracking the husk in its beak to feed on Aglaia fruit. Gunung Palung National Park, West Kalimantan, Borneo, Indonesia

Tim Laman / Black Hornbill (Anthracoceros malayanus) male cracking the husk in its beak to feed on Aglaia fruit. Gunung Palung National Park, West Kalimantan, Borneo, Indonesia

Tim Laman / Large ground finch (Geospiza magnirostris) cracking a seed on a branch. Santa Cruz Island, Galapagos Islands.

Luciano Candisani / Brown Capuchin (Cebus apella) using a rock as a hammer to crack a palm nut, Gilbues, Brazil

Luciano Candisani / Brown Capuchin (Cebus apella) using a rock as a hammer to crack a palm nut, Gilbues, Brazil

Yva Momatiuk & John Eastcott / Dry and cracking cakes of silt deposited by Colorado River during flood and drying during drought, fall morning, Glen Canyon National Recreation Area, Utah

Yva Momatiuk & John Eastcott / Dry and cracking cakes of silt deposited by Colorado River during flood and drying during drought, fall morning, Glen Canyon National Recreation Area, Utah

Yva Momatiuk & John Eastcott / Dry and cracking cakes of silt deposited by Colorado River during flood and drying during drought, fall morning, Glen Canyon National Recreation Area, Utah

Yva Momatiuk & John Eastcott / Coastal glacier descending to sea, Grandidier Passage, western Antarctica

Yva Momatiuk & John Eastcott / Coastal glacier descending to sea, Grandidier Passage, western Antarctica

Yva Momatiuk & John Eastcott / Coastal glacier descending to sea, Grandidier Passage, western Antarctica