Book excerpt: At Warburg, Germany, in 1941, four British PoWs find an unexpected means of escape from the horrors of internment when they form a birdwatching society, and embark on an obsessive quest behind barbed wire. Through their shared love of birds, they overcome hunger, hardship, fear and stultifying boredom. Their quest draws in not only their fellow prisoners, but also some of the German guards, at great risk to them all... Derek Niemann draws on original diaries, letters and drawings, to tell of how Conder, Barrett, Waterston and Buxton were forged by their experiences as POWs into the giants of post war wildlife conservation. Their legacy lives on, in institutions such as the RSPB and the British Wildlife Trust.