David Noton / Chocolate Hills, Bohol, The Visayas, Philippines. February 2011.

Pete Oxford / Salt mounds and evaporation ponds (sea salt production plant started in the 1600's and worked by african slaves) Cargill Solar Salt Works, Pekelmeer lagoon, Bonaire, Netherlands Antilles, Caribbean

Juergen Freund / Olive python (Liasis olivaceus) perched on top of a termite mound. Many pythons shelter in hollow termite mounds when not hunting. Queensland, Australia, February

Jabruson / Umbrella termite mound designed to repel heavy rain water, Mboko, Odzala NP, Democratic Republic of Congo.

Jim Brandenburg / American Bison (Bison bison) male, Blue Mounds State Park, Minnesota

Jabruson / Termite mound cooling chimneys - savanna near Mboko, Odzala National Park, Democratic Republic of Congo.

Nick Upton / Yellow meadow ant (Lasius flavus) nest mound on south facing chalk grassland slope, near Castle Combe, Wiltshire, March.

Alex Hyde / Wood Ant (Formica rufa) nest constructed from pine needles and other debris from the forest floor. Aosta Valley, Monte Rosa Massif, Pennine Alps, Italy. July.

Alex Hyde / Wood Ant (Formica rufa) nest constructed from pine needles and other debris from the forest floor. Aosta Valley, Monte Rosa Massif, Pennine Alps, Italy. July.

Alex Hyde / Wood Ant (Formica rufa) overhead view of nest constructed from pine needles and other debris from the forest floor. Aosta Valley, Monte Rosa Massif, Pennine Alps, Italy. July.

Jabruson / 'Kafa Tingunda' leaf shadows on elephant abrased termite mound on forest floor, Bai Hokou, Dzanga-Ndoki National Park, Central African Republic

Jabruson / Liana junction over termite mound in rainforest interior, Bai Hokou, Dzanga-Ndoki National Park, Central African Republic

Jabruson / Liana junction over termite mound in rainforest interior, Bai Hokou, Dzanga-Ndoki National Park, Central African Republic

Jabruson / Termite (Macrotermes) mound located in forest interior, Bai Hokou, Dzanga-Ndoki National Park, Central African Republic

Jabruson / Termite mound (Macrotermes) located close to elephant wallowing hole and used as a scratch post by passing African Forest Elephants (Loxodonta africana cyclotis). Agile Mangabey (Cercocebus agilis) pa...

Mark Carwardine / Termite mounds, Kasanka National Park, Zambia, Africa

Christophe Courteau / Aerial view of a termite mound in the Okavango Delta, Botswana. Vegetation grows on the mounds and creates islands.

Oriol Alamany / Termite mounds near Mopani, Kruger National Park, Transvaal, South Africa, September.

Robin Chittenden / Termite mound (Isoptera) land burnt around it, Gambia

Jim Brandenburg / Tree in tallgrass prairie, Blue Mounds State Park, Minnesota

Charlie Summers / Nile monitor (Varanus niloticus) climbing up termite mound, Serengeti National Park, Tanzania

David Noton / Chocolate Hills, Bohol, The Visayas, Philippines. February 2011

David Noton / Chocolate Hills, Bohol, The Visayas, Philippines. February 2011

Adrian Davies / Large mounds of Moss (Polytrichum commune) adjoining woodland, Snowdonia National Park, North Wales, UK, September

Juergen Freund / Olive python (Liasis olivaceus) perched on top of a termite mound. Many pythons shelter in hollow termite mounds when not hunting. Queensland, Australia, February

Chien Lee / Termite mounds, Wasur National Park, Indonesia

Toby Roxburgh / Rock mounds laid out as coast defence along the shoreline just north of the old Severn Crossing, River Severn, England, 2010.

Thomas Marent / Termite (Dicuspiditermes sp) mounds at base of tree, Gunung Leuser National Park, northern Sumatra, Indonesia

Thomas Marent / Termite (Dicuspiditermes sp) mounds at base of tree, Gunung Leuser National Park, northern Sumatra, Indonesia

Konrad Wothe / Magnetic Termite (Amitermes meridionalis) mounds, Cape York Peninsula, North Queensland, Queensland, Australia

Jim Brandenburg / Sioux Quartzite in tallgrass prairie with oncoming storm, Blue Mounds State Park, Minnesota

Jim Brandenburg / Common Hackberry (Celtis occidentalis) tree at sunset, Blue Mounds State Park, Minnesota

Jouan & Rius / Termite mounds and Baobab / Gourd trees (Adansonia gregorii) in savanna habitat, Kimberley, Western Australia. July 2009

Jim Brandenburg / Sioux Quartzite on tallgrass prairie, Blue Mounds State Park, Minnesota

Jim Brandenburg / Sioux Quartzite, Blue Mounds State Park, Minnesota

Jim Brandenburg / Common Hackberry (Celtis occidentalis) and Sioux Quartzite, Blue Mounds State Park, Minnesota

Jim Brandenburg / American Bison (Bison bison) herd in winter, Blue Mounds State Park, Minnesota

Wild Wonders of Europe / Benvie / Tinder built into charcoal mounds before ignition, Cartaya, Andalucia, Spain, April 2009

Wild Wonders of Europe / Benvie / Tinder / kindling built into charcoal mounds before ignition, Cartaya, Andalucia, Spain, April 2009

Wild Wonders of Europe / Benvie / Forest with charcoal mounds, Cartaya, Andalucia, Spain, April 2009

Wild Wonders of Europe / Benvie / Tractor for covering charcoal mounds, Cartaya, Andalucia, Spain, April 2009

Oriol Alamany / Kites (Milvus sp) catching insects in wildfire in Eucalyptus forest with termite mounds, Katherine / Nitmiluk, Northern Territory, Australia, November

Oriol Alamany / Termite mounds in Eucalyptus savannah, Mary River, Kakadu National Park, Northern Territory, Australia, November

Jouan & Rius / Termite mound in Central Desert, Northern Territory, Australia

Jouan & Rius / Termite mound, Kakadu National Park, Northern Territory, Australia

Jouan & Rius / Termite mound, Kakadu National Park, Northern Territory, Australia

Thomas Marent / Termite (Dicuspiditermes sp) mounds at base of tree, Danum Valley Conservation Area, Borneo, Malaysia

Thomas Marent / Termite (Dicuspiditermes sp) mounds in rainforest interior, Danum Valley Conservation Area, Borneo, Malaysia

Luiz Claudio Marigo / Aerial view of vegetation growing on old termite mounds enabling the grass to grow above the level of the annual flood, Rondônia State, Western Brazil

Luiz Claudio Marigo / Aerial view of vegetation growing on old termite mounds enabling the plants to grow above the level of the annual flood, Rondônia State, Western Brazil.

Tim Fitzharris / Cabbage Palm (Sabal sp) at Mounds Pool, St. Marks National Wildlife Refuge, Florida

Inaki Relanzon / Potholer walking on mounds of salt crystals in cave, Cave Lachambre, Ria, Conflent, Pyrenees, France

Thomas Marent / Magnetic Termite (Amitermes meridionalis) mounds in grassland, Litchfield National Park, Australia

Thomas Marent / Magnetic Termite (Amitermes meridionalis) mounds in grassland, Litchfield National Park, Australia

Jabruson / Termite mounds in rainforest, Ituri, Congo

WILLIAM OSBORN / Stewart highway through Outback with spoil mounds from opal mining, Coober Pedy, South Australia

Michael Durham / Bunchgrass prairie and mima mounds in spring at the Nature Conservancy Zumwalt Prairie Reserve, Oregon

Michael Pitts / Komodo dragon female on megapode mound (Varanus komodoensis) female uses these birds mounds for nesting site for her own eggs, Komodo Island, Indonesia

Michael Pitts / Komodo dragon female on megapode mound (Varanus komodoensis) female uses these birds mounds for nesting site for her own eggs, Komodo Island, Indonesia

Michael Pitts / Komodo dragon female on megapode mound (Varanus komodoensis) female uses these birds mounds for nesting site for her own eggs, Komodo Island, Indonesia

Thomas Lazar / Rock mounds, Dillon Pass, Badlands NP, South Dakota, USA

Thomas Lazar / Patterns on rock mounds, Dillon Pass, Badlands NP, South Dakota, USA

Owen Newman / Termite mounds, Northern Territory, Australia.

Owen Newman / Termite mound, Northern Territory, Australia.

Owen Newman / Magnetic termite mounds, Litchfield NP, Northern Territory, Australia.

Owen Newman / Termite mounds, Northern Territory, Australia.

Owen Newman / Termite mound, Northern Territory, Australia.

Owen Newman / Termite mound, Northern Territory, Australia.

Michael Hutchinson / Silbury Hill - world's biggest artificial prehistoric hill -near Avebury, Wiltshire, UK.

Roger Powell / Magnetic Termite mound - front view. Northern Territory, Australia

Dave Watts / Open savanna with termite mounds, Northern Territory, Australia.

Michael Hutchinson / Laufskalavordur / stone mounds made by early settlers, Iceland

WILLIAM OSBORN / Large numbers of Termitariums of {Nasutitermes triodiae} on open plains of Western Australia

Hanne & Jens Eriksen / Termite mounds in Kakadu NP, Northern Territory, Australia

Elizabeth White / Termite mounds, Whiteman Park, Western Australia

Jim Brandenburg / Indian Grass (Sorghastrum nutans) prairie, Blue Mounds State Park, Minnesota

Jim Brandenburg / Diamond mining dirt mounds, Namibia

Michael & Patricia Fogden / Gum Tree (Eucalyptus sp) woodland and termite mounds, Daly Waters, Northern Territory, Australia

Michael & Patricia Fogden / Magnetic Termite (Amitermes meridionalis) mounds, the broad side of the mounds always face east and west, an arrangement involved in thermal regulation, Litchfield National Park, Northern Territory, A...

Michael & Patricia Fogden / Magnetic Termite (Amitermes meridionalis) mounds, Litchfield National Park, Northern Territory, Australia

Mitsuaki Iwago / Termite mounds in the Tanami Desert, Australia

Jim Brandenburg / Stone fence at sunrise, Blue Mounds State Park, Minnesota

Jim Brandenburg / Bog Orchid (Habenaria sp), Blue Mounds State Park, Minnesota

Konrad Wothe / Termite mounds near Mareeba, North Queensland, Queensland, Australia

Jim Brandenburg / Sioux Quartzite in tallgrass prairie with oncoming storm, Blue Mounds State Park, Minnesota

Jim Brandenburg / Sioux Quartzite in tallgrass prairie, Blue Mounds State Park, Minnesota

Jim Brandenburg / Sioux Quartzite on tallgrass prairie, Blue Mounds State Park, Minnesota

Jim Brandenburg / Sioux Quartzite on tallgrass prairie, Blue Mounds State Park, Minnesota

Jim Brandenburg / American Bison (Bison bison) herd grazing with wind turbines in the distance, Blue Mounds State Park, Luverne, Minnesota

Ingo Arndt / Grass mounds, Sylt Island, North Sea, Germany

Jim Brandenburg / Lichen-covered rocks and full moon, Blue Mounds State Park, Minnesota

Jim Brandenburg / Blooming prairie flowers under gathering clouds, Blue Mounds State Park, Minnesota

Jim Brandenburg / Oblong scabbard clip, bronze Viking ornament excavated from burial mounds at tenth-century settlement in the forest of Gnezdovo, near Smolensk, Russia

Jim Brandenburg / Circular cloak fastener, bronze Viking ornament excavated from burial mounds at tenth-century settlement in the forest of Gnezdovo, near Smolensk, Russia

Jim Brandenburg / American Bison (Bison bison) herd in winter, Blue Mounds State Park, Minnesota

Jim Brandenburg / American Bison (Bison bison) herd in winter, Blue Mounds State Park, Minnesota