Paul Hobson / Mistle Thrush (Turdus viscivorus) successfully nesting on amber traffic light in city centre, Yorkshire. Winner of the Man and Nature category of the German GDT 2010 competition

Gavin Hellier / Low angle view of traffic sign and skyscrapers, Potsdamer Platz, Berlin, Germany, 2007. As was the case in much of Berlin, many of the buildings around Potsdamer Platz were turned to rubble by air rai...

Pat Tuson / 20 mph traffic speed limit zone sign against sky, London, UK

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...

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

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...

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.

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.

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

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

Ben Hall / 2020VISION / Logs for sale sign beside a busy road with passing traffic, The National Forest, Central England, UK, November 2010

Philippe Clement / The Meikleour Beech Hedge (Fagus sylvatica) the tallest and longest hedge on earth, reaching 30 metres (100 ft) in height and 530 metres (1/3 mile) in length, Scotland, UK, May 2010

Gerrit Vyn / A sign along the road alerting motorists to a Least Tern (Sternula antillarum) and Black Skimmer (Rynchops niger) nesting colony adjacent to the road. Gulf Islands National Seashore, which was affecte...

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

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

Pete Oxford / Humorous traffic signs erected by Donana Biological Station, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Humorous traffic signs erected by Donana Biological Station, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Spanish Lynx (Lynx pardinus) traffic signs, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Spanish Lynx (Lynx pardinus) traffic sign, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Spanish Lynx (Lynx pardinus) traffic sign, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Spanish Lynx (Lynx pardinus) traffic signs, Sierra de Andujar Natural Park, Andalusia, Spain

Pete Oxford / Spanish Lynx (Lynx pardinus) traffic sign, Sierra de Andujar Natural Park, Andalusia, Spain

Nick Garbutt / Polar Bear warning road sign on outskirts of Longyearbyen, Spitsbergen, Svalbard, Arctic Norway, June 2009

Juan Manuel Borrero / Road with a traffic warning sign for the conservation of Spanish lynx (Lynx pardina). Sierra de Andujar Natural Park, Jaen, Spain. 2009.

Juan Manuel Borrero / Road traffic warning sign for the conservation of Spanish lynx (Lynx pardina). Sierra de Andujar Natural Park, Jaen, Spain. 2009.

Juergen Freund / Cassowary protection warning road sign, Western Australia

Juergen Freund / Sign "Crabs Cross Here" Christmas Island Red Crabs (Gecarcoidea natalis) Migration

Colin Seddon / Badger warning road sign, Scotland, UK

Colin Seddon / Road sign warning about European river otters (Lutra lutra) crossing the road, UK

Richard Du Toit / Animals crossing warning sign near Mkuzi Game Reserve, South Africa

Juergen Freund / Traffic information sign for annual Christmas Island red crab migration (Gecarcoidea natalis) Indian Ocean

Solvin Zankl / Road sign warning of European river otter {Lutra lutra} Shetland Islands, Scotland, UK

Niall Benvie / Toad (Bufo bufo) crossing warning sign, part of UK species protection, Scotland

Pete Oxford / Chameleon road crossing warning sign, Madagascar

Gavin Hellier / Traffic lights with walk sign lit, next to Gaudi's La Sagrada Familia, Barcelona, Catalunya, Spain