Many people contributed to the writing of The Language of Animals in 1995, and since the debut of The Animal Communication Project, helpers and contributors have reached the nearly mythical “too numerous to mention.” To all of you, my heartfelt thanks.

My wife, Karen Hart, professor of biology at Peninsula College, and my son Robbie Hart, a PhD biologist at the Missouri Botanical Garden and UMSL (more information), have contributed uncounted dinner-table conversations and e-mails about animal communication, and many helpful suggestions. Robbie has contributed some of the images on the ACP.

The Animal Communication Project represents a synthesis of thousands of pieces of information in the form of research papers (and “digests” for journalists), telephone interviews with researchers, first-hand observations, and thousands of e–mail messages, not to mention popular books, text books, popular magazine articles and videos.