Matthew Maran / Farmer spreading slurry on organic dairy land. Slurry collected from the cattle herd is recycled as natural fertiliser, Devon, England, UK, July.

Matthew Maran / Dairy cows on organic farm feeding on pellets during milking, East Devon, England, UK, July.

Ross Hoddinott / Cow in field on a misty morning, near Bradworthy, North Devon, UK. July 2012.

Ross Hoddinott / Domestic cattle, one standing one lying down in field on a misty morning, near Bradworthy, Devon, UK, August.

Ross Hoddinott / View of cows grazing coastal fields from Hope Cove towards Thurlestone, Bigbury Bay and Burgh Island. Evening light. Near Salcombe, South Devon, UK. September 2009.

Merryn Thomas / Jersy cows grazing in field at Thurlestone in the early morning. South Devon, September 2009.

Merryn Thomas / Jersey cows grazing in field at Thurlestone in the early morning. South Devon, September 2009.

Rob Cousins / Devon "Ruby" Red cattle (Bos taurus) eating hay, UK

Rob Cousins / Devon "Ruby" Red cattle (Bos taurus) feeding on hay, UK

LYNN M. STONE / Two South Devon Cows (Bos taurus) in field, Wisconsin, USA

Michael Hutchinson / Bullocks lying in grass with Hound Tor granite outcrop background. Dartmoor National Park, Devon, England, UK.

Michael Hutchinson / Cow {Bos taurus} lying in grass with Hound Tor granite outcrops (landmark and tourist attraction) in background. Dartmoor National Park, Devon, UK.