Sadly it's not just management, or indeed RFFS, who do not understand the niceties of bird management. A number of years ago I was responsible for a small aerodrome and had an interesting conversation with the regulator. Looking out of the window he asked if we operated a long grass policy to which I replied yes. He then said, " It doesn't work then. What are all those black things I can see? Crows in your long grass." He then suggested I read the Manual of Bird Control at Aerodromes. Rather than prolong the interview I bit my tongue and declined to correct his ornithology, they were rooks. I also chose not to point out that if he read the book he would discover that corvids will, in fact, loaf in long grass.