Andrew Painting is a seasonal ecologist at Mar Lodge Estate, the UK’s largest nature reserve in the Cairngorms. His new book, Regeneration: The Rescue of a Wild Land takes a species-by-species look at this landscape through time, focusing on recent conservation efforts that are beginning to pay off. Here he describes a walk around Clais Fhearnaig to show how that story is written onto the landscape. The headlines of the unfolding environmental recovery of Mar Lodge Estate are startling. 30,000-odd hectares of land, holding 15 Munros. Over 5,000 species, with more recorded every year. Ancient tracts of Caledonian pinewood, with…