“Of 22 sites surveyed in 2013, this farm had more pairs of waders than any other. With 80 pairs in total, numbers of farmland waders were high enough for the farm to be regarded as a key wader site.” (http://www.rspb.org.uk/media/releases/371107-curlew-champion-meets-his-match)

A similar survey is tracking the haunts of regular wellington boots.