evidence: Known also as "cup and rings", these rock carvings were made by our Neolithic and Early Bronze Age ancestors between 6,000 and 3,800 years ago. About 7,000 carved panels are known about – occurring mostly in England (3,500 panels) and Scotland (2,500 panels). [...] But being out in the open, these carvings are now under threat. These ancient artefacts are deteriorating primarily because of modern life – with increasing population densities, agricultural activity, and climate change all taking their toll. Indeed, in many places the rocks have been scratched by livestock, and driven over by cars, tractors or farming equipment. [...] It is hoped that by monitoring the rock art in this way, it can help to preserve it for future generations to enjoy. And while we can’t be sure about the thoughts and feelings of the people who made the carvings, it is hoped our neolithic ancestors would approve of the efforts being taken to try and ensure their art survives for many thousands of years to come.