Wild Wonders of Europe / della Ferrera / Person pointing at mine warning sign in a mine field near the village of Zadrzani, Northern Livanjsko Polje, an area affected by war (1991-1995) Bosnia and Herzegovina, May 2009

Niall Benvie / Spoof warning sign about scarcity of cod in the sea, Aberdeenshire, Scotland, UK

Jouan & Rius / An old barrel at the diamond area border being used as a sign post warning people not to enter, Namib desert, Namibia

Staffan Widstrand / Moose warning sign on roadside, Sweden.

Gavin Hellier / Low flying aircraft warning sign at Maho Beach, St Martin, Leeward Islands, Lesser Antilles, Caribbean, West Indies 2008

Staffan Widstrand / Warning sign for Polar Bear (Ursus maritimus) Svalbard, Norway

Tony Phelps / Warning sign explaining that rhino horns within reserve are poisoned and coloured. Private game reserve, near Ceres, Karoo, South Africa, November

Tony Phelps / Baboon warning sign. Cape Point. Table Mountain National Park, Cape Town, South Africa, October

Wild Wonders of Europe / Widstrand / Land mine warning, as result of war activity, Velebit Nature Park, Rewilding Europe area, Velebit mountains, Croatia June 2012

Adrian Davies / Warning sign highlighting the danger caused by a Cyanobacteria / Blue-green (Trichodesmium erythraeum) algal bloom in a lake, Richmond Park, Surrey, England, UK, October.

Enrique Lopez-Tapia / Zanzibar red colobus (Piliocolobus kirkii) two colobus crossing the road that bisects the forest Jozany, with sign that warns of the danger of collision with the colobus, Jozany Forest, Zanzibar. Hig...

Robin Chittenden / Chalara Ash dieback information sign in Ashwellthorpe Wood NWT Norfolk UK November 2012. Disease is caused by fungus (Chalara fraxinea)

Robin Chittenden / Chalara Ash dieback information sign in Ashwellthorpe Wood NWT Norfolk UK November 2012. Disease is caused by fungus (Chalara fraxinea)

Anup Shah / African Forest elephant (Loxodonta africana cyclotis) female and calf giving out warning signs, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic. December 2011.

Anup Shah / African Forest elephant (Loxodonta africana cyclotis) female and calf giving out warning signs, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic. December 2011.

Nick Upton / Sign warning when it is unsafe to cross a tidal causeway, with the Worm's head cut off from the mainland as an island at high tide, Rhossili, The Gower peninsula, Wales, UK, July. Sequence 2 of 2 matc...

Peter Cairns / 2020VISION / Sign warning against black grouse disturbance at Abernethy Forest, Cairngorms National Park, Scotland, March 2012.

Dave Watts / Southern cassowary (Casuarius casuarius) adult male crossing road near road warning sign, World Heritage National Park rainforest of the Wet Tropics, north Queensland, Australia, digital composite

Dave Watts / Southern cassowary (Casuarius casuarius) adult male crossing road near road warning sign, World Heritage National Park rainforest of the Wet Tropics, north Queensland, Australia, digital composite

Roland Seitre / Roadsign warning drivers to drive slowly in koala areas. Kangaroo Island, South Australia.

Linda Pitkin / 2020VISION / Toad crossing sign warning motorists about migratory toads. Surrey, England, March. Did you know? In captivity a toad can live for up to 50 years.

Linda Pitkin / 2020VISION / Toad crossing sign warning motorists about migratory toads. Surrey, England, March.

Linda Pitkin / 2020VISION / Toad crossing sign warning motorists about migratory toads. Surrey, England, March.

Roland Seitre / Road sign warning road-users to slow down in areas where Colobus Monkeys live. Ukunda, Diani Beach, Kenya.

Dave Watts / Little penguin (Eudyptula minor) crossing road warning sign, The Neck, Bruny Island, Tasmania, Australia, January 2011

Dave Watts / Road warning sign for Wedge-tailed eagles (Aquila audax) feeding on road, Tasmania, Australia, February 2011

Roland Seitre / Road sign warning drivers to watch their speed in areas inhabited by the Iberian / Spanish Lynx (Lynx pardina). Sierra Morena, Andalusia, Spain, June 2006.

Roland Seitre / Road sign warning drivers to watch their speed in areas inhabited by the Iberian / Spanish Lynx (Lynx pardina). Sierra Morena, Andalusia, Spain, June 2007.

Roland Seitre / Road sign warning drivers to watch their speed in areas inhabited by the Iberian / Spanish Lynx (Lynx pardina). Sierra Morena, Andalusia, Spain, June 2006.

Sandesh Kadur / An elephant road warning sign. Many roads were first built roughly following the well-worn pathways of migrating elephants. Today, numerous highways laden with lorries crisscross these ancient migrato...

Merryn Thomas / "Dangerous Cliffs: No Access to Beach" warning sign, Bantham Bay, South Devon, UK. January 2009.

Merryn Thomas / "Dangerous Cliffs: No Access to Beach" warning sign, Bantham Bay, South Devon, UK. January 2009.

Merryn Thomas / "Dangerous Cliffs: No Access to Beach" warning sign, Bantham Bay, South Devon, UK. January 2009.

Merryn Thomas / "Dangerous Cliffs: No Access to Beach" warning sign, with Burgh Island in the distance. Bantham Bay, South Devon, UK. January 2009.

Merryn Thomas / Coastal warning sign for tidal waters and mudflats on Westward Ho! beach, North Devon. January 2009.

Merryn Thomas / Warning sign on old crane (1863) on Cotehele Historic Quay, River Tamar, Cornwall, UK. April 2009.

Nick Turner / Dangerous currents warning information sign at Caerfai Bay on the Pembrokeshire Coast Path, Wales, June 2009.

Nick Turner / Lifeguard warning information sign on the Pembrokeshire Coast Path, Wales, UK, June 2009.

Inaki Relanzon / Wildlife crossing warning road sign and Injured wildlife contact number, Cape Otway, Great Otway National Park, Victoria State, Australia, September 2011.

Inaki Relanzon / Koala warning road sign, Cape Otway, Great Otway National Park, Victoria State, Australia, September 2011.

Inaki Relanzon / Fox poison warning sign attached to tree, Great Otway National Park, Victoria State, Australia, September 2011.

Adrian Davies / Notice warning of danger of Ticks, Richmond Park, Surrey, England, October

Adrian Davies / Deer warning sign in Richmond Park, Surrey, England, UK, October 2011

Adrian Davies / Warning sign for Blue Green Algae, Richmond Park, Surrey, England, UK, October 2011

Tony Phelps / Angulate tortoise (Chersina angulata) adult male crossing road with tortoise traffic warning sign and car passing on Route 62 near Oudtshoorn, Little Karoo, Western Cape, South Africa

Tony Phelps / Angulate tortoise (Chersina angulata) adult male crossing road with tortoise traffic warning sign and car passing on Route 62 near Oudtshoorn, Little Karoo, Western Cape, South Africa

Ann & Steve Toon / Red squirrel (Sciurus vulgaris) road traffic warning sign in the buffer zone of Kielder Forest red squirrel reserve area, Northumberland, UK, July 2011.

Bert Willaert / Sign warning that hunting turtles or collecting their eggs is illegal. Coast of Ghana, October 2010.

Dave Watts / Kangaroo and Wombat road crossing warning sign, Victoria, Australia

Dave Watts / Kangaroo and Wombat road crossing warning sign, Victoria, Australia

Dave Watts / Koala road crossing warning sign, Southern Australia

Dave Watts / Koala road crossing warning sign, Southern Australia

Dave Watts / Wombat road crossing warning sign, Southern Australia

Dave Watts / Wombat crossing road warning sign, Southern Australia

Christophe Courteau / Sign warning of danger of Polar bears, Ny-Alesund International Research village, Spitzbergen, Svalbard, Norway, July 2011 / Panneau d'avertissement de danger en raison de la presence possible d'o...

Christophe Courteau / Sign warning of ground nesting birds, Ny-Alesund International Research village, Spitzbergen, Svalbard, Norway, July 2011 / Panneau d'avertissement pour indiquer la nidification d'oiseaux dans le v...

Adrian Davies / Otter (Lutra lutra) crossing sign on road. Shetland, Scotland, UK, June 2011.

Jeff Rotman / Shark warning sign on Botany Bay beach. Sydney, Australia.

Ernie Janes / Flood warning sign beside road crossing flooded Old Bedford River, Norfolk, Winter

Ernie Janes / Flood warning sign beside road crossing flooded Old Bedford River, Norfolk, Winter

Ernie Janes / Warning sign for road / track closed due to coastal erosion, Happisburg, Norfolk, UK

Bryan and Cherry Alexander / Traffic warning sign for sleds in Ilulissat. West Greenland, 2008.

Bryan and Cherry Alexander / Road sign warning of Polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.

Bryan and Cherry Alexander / Road sign warning of polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.

Bryan and Cherry Alexander / Road sign warning of polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.

Adrian Davies / Warning sign 'Bull in Field'. UK, Europe.

Adrian Davies / Warning sign 'Bull in Field'. UK, Europe.

Bryan and Cherry Alexander / Sign warning against dumping rubbish near water reservoir of drinking water, near Igloolik. Nunavut, Canada, April 2008.

Eric Baccega / Polar Bear (Ursus maritimus) warning sign "Don't walk in the area" Churchill, Manitoba, Canada, March 2011.

Jeff Vanuga / Snail / Everglade Kite (Rostrhamus sociabilis) in natural habitat perching on warning sign. Endangered species. Florida, USA, April.

Matthew Maran / A sign warning hikers about tribal reserve lands. The West Coast Trail, Pacific Rim National Park, Vancouver Island, Canada, September 2010.

Adrian Davies / Caution Poison Ivy (Toxicodendron / Rhus radicans) warning sign. Florida, USA, January.

Mark Carwardine / Sign warning of the health risks of close contact between people and Mountain gorillas, Buhoma, Bwindi Impenetrable Forest, Uganda, October 2008

Toby Roxburgh / Notice advising visitors to Inner Farne not to go on the beach to avoid disturbing a colony of nesting Arctic terns (Sterna paradisaea), Farne Islands, Northumberland, England, July 2010.

Toby Roxburgh / Group of walkers standing on top of the cliffs looking out at the view, Bedruthan Steps, Cornwall Area of Outstanding Natural Beauty (AONB), England, August 2010.

Alex Mustard / Manatee zone slow speed warning sign for motor boats. Florida manatees (Trichechus manatus latirostris) Crystal River, Florida, USA. February 2010

Alex Mustard / Speed warning sign for motor boat users about danger to Florida manatees (Trichechus manatus latirostris) Crystal River, Florida, USA. February 2010

Andrew Walmsley / Cassowary warning road sign in Daintree National Park, Queensland, Australia, November 2006

Philippe Clement / Warning sign and barrier for migrating amphibians / toads (Bufo bufo) crossing the road during annual migration in the spring, Belgium, March 2010

Philippe Clement / Warning sign and barrier with buckets for migrating amphibians / toads (Bufo bufo) crossing the road during annual migration in the spring, Belgium March 2010

Bryan and Cherry Alexander / Sign warning of dog sleds on ice road between Thule Air Base and Dundas. Northwest Greenland, 1980.

Adrian Davies / Warning sign and protective cage over nest site of Loggerhead Turtle (Caretta caretta) Platanias, Crete, Greece. July 2010

Staffan Widstrand / Road sign warning of Camels, Dubai, United Arab Emirates, February 2007

Bryan and Cherry Alexander / Sign warning motorists of Reindeer crossing the road. Inari, Finland, 1996.

Bryan and Cherry Alexander / Polar bear (Ursus maritimus) alert warning sign - Dont' walk in this area - Churchill, Manitoba, Canada, 1981.

Bryan and Cherry Alexander / Warning sign for high levels of PCBs at an old DEW line station. Melville Peninsula, Nunavut, Canada, 1992.

Adrian Davies / Military firing range Keep Out warning sign, in spring woodland, with carpet of Wild Garlic (Alium ursinum) Tyneham, Dorset, England.

Adrian Davies / Sign warning people of risk to their vehicles from Vultures. Anhinga Trail, Everglades, Florida, USA

Adrian Davies / Road warning sign Panther / Puma crossing, Everglades, Florida, USA

Adrian Davies / Alligator warning sign, Everglades, Florida, USA

Steven Kazlowski / Caution sign warning of the danger of Polar bears in the area, Longyearbyen, Isfjorden, Svalbard Archipelago, Norway

Philippe Clement / Traffic warning sign for crossing European pond turtle (Emys orbicularis) La Brenne, France

Kirkendall-Spring / Ski at own risk sign. Mount Baker Ski Area in the North Cascades. Washington, USA, April 2009

Steven David Miller / Sign warning visitors of the danger Dingo may cause. Western beach of Fraser Island, Queensland, Australia

Patricio Robles Gil / Sign warning tourists of liklihood of not seeing a tiger on a visit to Bandhavgarh NP, Madhya Pradesh, India

Adrian Davies / Sign warning against taking frog / toad spawn from water, or adding any spawn to the water, Richmond Park, London, England