The remarkable success of Simon Weber's book on owls, bats, foxes and other nocturnal creatures, A Call in the Dark, is probably not surprising in view of the popularity of his recent television series, 'Night Prowlers'. It is a very thorough book by an author who is an expert in his field and who has clearly done a lot of research. In addition to describing his own findings, he cites the research carried out by others, including Wright and Lawson in the 1990s, and discusses where they might have gone wrong with some of their assumptions. He writes coherently on the subject, beginning by looking at basic facts before discussing progressively complex theories, without once confusing his readers. This is a remarkable feat, considering the complexity of the subject and the science that is often involved.