First published in 1995. Routledge is an imprint of Taylor & Francis, an informa company.

First published in 2007. Routledge is an imprint of Taylor & Francis, an informa company.

Dr. Heuvelmans, the founder of Cryptozoology, or the science of unknown animals, was an enormously influential explorer and an industrious writer who changed the way in which we perceive natural history, the living world and evolution.

This book, approved by Dr. Heuvelmans before his death in 2001, contains key writings, the majority of which have never been published before, drawn from his work, an overview of the development of Cryptozoology, Dr. Heuvelman's thinking on the subject he invented, from the initial scepticism and even derision from the scientific community to an ultimate acceptance of most of his ideas.

'Readers will learn of some of the accounts of strange and unknown fauna revealed to the world from the ocean depths, in a methodical, concise, very well-researched, and easy-to-read format' Quarterly Review of Biology

On the Track of Unknown Animals presents evidence for the existence of numerous other large animals which have been reported by local people, but which have not yet been identified and described by science. The still 'hidden' animals presented here include the man-faced creatures of Southeast Asia, the living fossils of Oceania, the reported giant sloth and still unknown apes of South America, stories of mammoths still ranging over the Siberian taiga, as well as descriptions of many as yet unexplained strange creatures of the African jungles. A current topic of leading interest in cryptozoology is the accumulating body of evidence that Neanderthal Man - a relative of modern man but a separate species from Homo sapiens - almost surely lived simultaneously with modern man into historic times, and is probably still living in remote jungles and mountain fastnesses of the Asian Continent.