This comprehensive and thoroughly updated text surveys comparative vertebrate endocrinology. Intended for an upper division undergraduate class in endocrinology, this useful reference will also prove invaluable to faculty, researchers, and graduate students who require up-to-date information on a myriad of endocrine systems. This third edition focuses more attention on mammalian systems, neuroendocrinology, and molecular endocrinology. The text has been extensively reviewed by faculty who teach endocrinology and should establish a new teaching standard for comparative vertebrate endocrinology. It is thoroughly revised and updated. It provides comprehensive coverage of comparative endocrinology. It is illustrated with numerous drawings, graphs, and photomicrographs.