The diary is a difficult form. If it is truly a diary, a great deal of it will be boring even to the diarist, which is why so few people manage to keep one going. The genuine diary of a remarkable person can, of course, make good reading if intelligently edited, but a diary written in order to be published, however remarkable its author – well, it can’t be what it calls itself because it has to be ‘made interesting’, so the form puts an uncomfortable strain on the writer. In the case of Esther Woolfson’s new book the words ‘Field Notes’ are also somewhat misleading, because much of the information it contains comes from the author’s reading rather than from observation: she cites some ninety authorities. What the book gives us is a picture of wildlife in Aberdeen, a city not remarkable for the richness of its wildlife except for its gulls; but that doesn’t matter, because what Woolfson specialises in is demonstrating how little most people understand about creatures they think ordinary.