MacMillan Publishing Company
Why does a bird in autumn fly from the prairies of North America to the pampas of the Argentine? How can it accomplish such a remarkable feat? How is it guided? What stimulus induces its return flight? There is evidence that from the beginnings of recorded history man has wondered at the seasonal appearance and departure of certain animals to and from his lands. And as his knowledge about this phenomenon has increased, so has his fascination with it.
Animals in Migration is a beautifully illustrated, comprehensive account of the most recent developments and concepts relating to the movements of animal populations. Whereas most previous books on the subject have been confined to a single class of organisms – such as birds, fish, or mammals – this brilliant study gathers together under one cover the basic principles underlying all animal migrations. It integrates information from a broad spectrum of the newest scientific research – all of which has been carefully investigated and documented – to bring previously existing knowledge completely up to date.
In Animals in Migration, Robert T. Orr, author of The Animal Kingdom and one of America’s foremost naturalist-zoologists, combines scientific authority with a lucid, informative style and an obvious joy in his subject. He discusses in detail the types of population movements, the reasons for migration, and environmental influences on migration. He offers careful comparative analysis of the factors involved in the migration of land and water birds, mammals, insects, fishes, amphibians, and reptiles. He illuminates the mechanics of migration; discusses migratory mortality; and explores current methods of studying migration.
Many of the mysteries of animal migration remain unsolved. It is perhaps one of Dr. Orr’s most important contributions that his book goes beyond available answers to suggest keys that may someday unlock one of nature’s most closely guarded secrets.
Robert T. Orr, born in San Francisco in 1908, graduated from the University of San Francisco in 1929 and received his Ph.D. from the University of California at Berkeley in 1937. He joined the California Academy of Sciences in 1936 and is presently associate director of that institution, as well as curator and chairman of its Department of Ornithology and Mammalogy. In 1942, Dr. Orr joined the faculty of the University of San Francisco, where he taught graduate and undergraduate studies in biology for twenty-two years.
Author of the popular and critically acclaimed The Animal Kingdom and the widely known textbook Vertebrate Biology, Dr. Orr has also written more than two hundred scientific and popular articles. He has carried on important research on marine animals, and was one of the organizers of the Galapagos International Scientific Project in 1964.
Dr. Orr is a fellow of the American Association for the Advancement of Science , a fellow of the California Academy of Science, past president of the American Society of Mammalogists, and a member of twenty-three scientific societies.