Pat Tuson / London House Sparrow Parks Project sign showing an area of Laycock Street Park in Highbury fenced in and planted with wild flowers as an experiment by the RSPB and Islington Council to encourage Sparr...

Pat Tuson / London House Sparrow Parks Project sign showing an area of Laycock Street Park in Highbury fenced in and planted with wild flowers as an experiment by the RSPB and Islington Council to encourage Sparr...

Pat Tuson / Farmers' Market sign or billboard in smart urban street with bank in background, Marylebone High Street, City of Westminster, London, England, UK, November 2013.

David Woodfall / Flood warning sign during January 2014 flooding, Somerset Levels, England, UK, 9th January 2014.

Mark Taylor / Car park flooded by River Wey, with cars almost completely submerged during Christmas 2013 flooding, Guildford. Surrey, England, UK. 25th December 2013.

David Woodfall / Road closed sign in flooded lane following February 2014 floods in Severn valley, Gloucestershire, England, UK, 7th February 2014.

Will Watson / River Severn floodwaters on road, Worcester, England, UK, 13th February 2014.

Ann & Steve Toon / Zebra crossing animal warning sign, Namib Desert, Namibia, April

Enrique Lopez-Tapia / Traffic sign warning of penguins crossing. Ushuaia, Tierra del Fuego, Argentina.

Roland Seitre / Road sign warning of shearwaters crossing, Mouli, Ouvea, Loyalty Islands Province, New Caledonia.

Pat Tuson / Camley Street NW1 street sign with Three-cornered Leek / Wild Onion (Allium triquetrum) at Camley Street Natural Park, Kings Cross, London Borough of Camden England, UK

David Woodfall / Virginia creeper (Parthenocissus sp) growing over street sign and lamp post, adaptation of plants to opportunity, UK