Nick Davies, Cuckoo: Cheating by Nature (London: Bloomsbury, 2016; 2015), p. 50:
When Nature managed the fens, there was plenty of suitable habitat for reed warblers and cuckoos. Now we are in charge, their future is in our hands. If we want reed warblers and cuckoos in our landscape we'll have to manage the land and pay for them, just as we do for our agricultural crops.