Just in case you're interested the latest volume in the Collins New Naturalist series is on
Galloway and the Borders - written by Derek Ratcliffe just before he, sadly died, last year. Full of lots of information about the natural history of the Borders area.
Amazon.co.uk: Galloway and the Borders (Collins New Naturalist): Books: Derek Ratcliffe
£16-50 in paperback from Amazon at the moment