No two subjects are more intrinsically fascinating than ethology and analytical psychology, yet, until the first edition of this publication appeared, no one had attempted to link them together in the same book. This is a strange omission, for not only do both disciplines complement one another in a number of important ways, but both command large audiences which, I suspect, overlap to a greater extent than is generally realized. Moreover, Jungians have, on the whole, tended to remain aloof from the rapid developments occurring in ethology, while, with a few notable exceptions, ethologists have displayed grand indifference to the work of Jung.