" Ritchie Tassell is the person to whom I have most often turned when trying to feel my way through this story. He has a voracious appetite for reading, and made some of the key discoveries in the literature that feature in this book. More importantly, he has an engagement with the natural world so intense that at times it seems almost supernatural. Walking through a wood he will suddenly stop and whisper ‘sparrowhawk’. You look for the bird in vain. He tells you to wait. A couple of minutes later a sparrowhawk flies across the path. He had not seen the bird, nor had he heard it; but he had heard what the other birds were saying: they have different alarm calls for different kinds of threat. "

― George Monbiot , Feral: Rewilding the Land, the Sea and Human Life