Birds of Kenya and Northern Tanzania is a wonderful reference book of East African birds. Its Comprehensive,informative and brilliantly illistrated, but.............I do wonder about its usage as a field guide for two main reasons. Firstly, its not the cheapest publication in its subject area and though the hardback version is undoubtedly robust, if you love your books as I do, then packing it, unpacking it and thumbing through it on safari might cause you to wince a little. Secondly, its a heavy publication and not for the faint hearted on a bird walk, particularly if your going to juggle binoculars, camera and note book as well. I certainly want it on my library shelf but will use it alongside smaller, lighter but less comprehensive publications in the future, Perhaps the paperback version offers a more useful option in the field.