03077     2200217   4500001002100000005001500021035002000036008004100056245008800097100001900185260003600204300002500240020001800265084001800283520249100301082001202792650002102804650001302825990001002838990001102848INLIS00000000000252320220207015401  a0010-0621002123220207                g          0 eng  1 aHandbook Of Marine Mammals :bVolume 4 Rives Dolphins And The Larger Toothed Whales1 aRidgway, Sam H  aLondon :bAcademic Press,c1989  a442 hlm. ;c23,5 cm.  a0-12-588504-0  aR.559.5 RID h  aHandbook of Mammals Volume 4 River Dolphins and The Larger Toothed Whales Interest in marine mammals has increased greatly in recent years as our knowledge of them has grown. In particular, the large cetacean brain and the supposed superior intelligence of marine mammals over other animals, in conjunction with their obvious diving and swimming abilities, have made them fascinating creatures to study. Public involvement in the effort to conserve them from hunting by man and newly discovered ways of catching and maintaining them in captivity have all helped to increase their popularity and importance. In some cases this has resulted in the establishment of codes of practice for their capture, harvesting and transportation and has improved their lot from being mere objects of curiosity and participants in circus acts. However, the natural habitat of these animals has not facilitated a systematic investigation of them, and the marine mammalogist must necessarily specialize in one or a few types. It would be virtually impossible, therefore, for a single author to compile a complete description of the whole range of these animals, from walruses and whales to dugongs and manatees. In the light of this consideration the Handbook of Marine Mammals was commissioned as a series of separate accounts of a single marine mammal. Each chapter is the outcome of many personal experiences of an international expert on the particular animal, and so includes subtle observations which might be unknown or overlooked by an ordinary reviewer. With the aid of distribution maps, identification pointers and spectacular photographs and drawings, as much as is known of each animal about its biology and life history is reviewed, and its identifying characteristics and distribution described. Similarities and differences are stressed and some mention is made of economical and commercial aspects. A full bibliography is included for each chapter. It must be emphasized that these books are primarily a guide to the biology of marine mammals in their natural environment and are meant for use in the field as a practical aid to identification and to provide useful basic information
they are not concerned with management, husbandry or treatment of disease. The greatest value of this outstanding illustrated series of volumes will be to research workers, academics and students of marine mammalogy, but anyone with a reasonable background in modern biology will find them absorbing. of  aR.559.5 4aBinatang Mamalia 4aHandbook  a06582  a024321