Population Studies of Birds. By David Lack. Clarendon Press, Oxford, 1966. 341 pages; 1 photographic plate; many textfigures. 63s. Dr. Lack's first book on animal populations, The Natural Regulation of Animal Numbers (1954), embraced all animals, but most of the detailed studies he dealt with were of birds, primarily because birds had been more studied than other groups. It has had a great influence on our thinking about animal populations; also, of course, it has had its critics. Meanwhile, in the twelve years since it was published, much new work on animal populations, and especially bird populations, has been carried out, which makes it possible to test more critically some of the conclusions of the earlier book. Accordingly, Dr. Lack has followed it up with this sequel, in which he concentrates entirely on birds. The main part of the book is devoted to 13 species, the criteria for their inclusion being that they should have been studied for at least four years and that the study should have consisted of a good deal more than just an annual census. In addition, a number of lesser studies of other species have been included, if they show important parallels to the main species or bring out additional points. It is perhaps of interest that, although the criteria for inclusion were applied impartially, nine of the 13 main studies were of British birds in Britain (two of them were studied outside Britain as well). None of them was from the U.S.A., in spite
Issue 11
Cramp, S
Snow, D. W

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