Ashley Cooper / Chinese tourist from Antarctic expedition cruise ship taking selfie with Gentoo penguin (Pygoscelis papua) that has walked up to her. Antarctic Peninsula, Antarctica. February 2019.

Juan Carlos Munoz / Woman wearing traditional costume of flower seller photographing group also in traditional costume. The Stone Forest, Shilin Yi, Yunnan Province, China. 2016.

David Fleetham / Two girls in traditional costume for cultural ceremonies taking a photo with a smartphone on beach. Yap, Micronesia. September 2013. Model released.

Adrian Davies / Hermaness National Nature Reserve sign at entrance, Shetland, Scotland, May 2013.

Adrian Davies / Mousa RSPB Nature Reserve sign at reserve entrance, Mousa, Shetland, Scotland. May 2013.

Christophe Courteau / Sign warning of ground nesting birds, Ny-Alesund International Research Village, Spitzbergen, Svalbard, Norway, June, 2012.

Christophe Courteau / Sign warning of ground nesting birds, Ny-Alesund International Research Village, Spitzbergen, Svalbard, Norway, June, 2012.

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

Michele Westmorland / Tourists walking from Charles Darwin Research Centre, Galapagos Islands, August 2010. Model released.

Michele Westmorland / Sign for walking trail in Charles Darwin Research Center, with Opuntia cactus, Galapagos Islands.

Bert Willaert / Canande Reserve sign, owned by the Jocotoco conservation foundation. Ecuador.

Chris Mattison / No Fly Tipping sign, Peak District, Derbyshire, England, UK, May.