Eric Baccega / Portrait of woman from the Mursi tribe, traditionally decorated and painted, wearing a large clay lip plate, Omo Valley, Ethiopia, March 2015.

Alan Murphy / Clay-colored Thrush (Turdus grayi) and Great Kiskadee (Pitangus sulphuratus) pair fighting, Texas

Alan Murphy / Clay-colored Thrush (Turdus grayi) feeding on berries, Texas

Clay Bolt / Rough Green Snake (Opheodrys aestivus) in undergrowth, Southern Appalachians, South Carolina, USA, North America, June.

Laurent Geslin / Mursi woman with large clay plate in lower lip, showing her age, Omo valley, Ethiopia, 2006

Laurent Geslin / Young Mursi woman with clay plate in lower lip, holding her Kalashnikov rifle (result of the cold war in Africa), Omo valley, Ethiopia, 2006

MYN / Clay Bolt / Two-lined salamander (Eurycea bislineata) on autumn leaf, North Carolina, USA, November, meetyourneighbours.net project

MYN / Clay Bolt / Stink Bug Nymphs (Pentatomidae) three, Pickens County, South Carolina, USA, meetyourneighbours.net project

MYN / Clay Bolt / Pink lady's slipper orchid (Cypripedium acaule) Pickens County, South Carolina, USA, April. meetyourneighbours.net project

Terry Whittaker / 2020VISION / Heavy earth excavator removes clay for future replacement with topsoil. Wetland habitat ecosytem creation for the RSPB by Breheny Civil Engineers at Bowers Marsh RSPB Reserve, Thames Estuary, Essex, U...

Jack Dykinga / Eroded formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the night sky...

Jack Dykinga / Eroded rock formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the nigh...