Bernard Heuvelmans is the founder of cryptozoology - the science of hidden animals. Whereas palaeontology discovers and describes organisms of the past, cryptozoology does the same with animals of the present. At a time when many known species have become extinct or endangered, it is exciting and affirmative to discover previously unknown species in our midst. First published before the validity and importance of the subject was recognized, and now rewritten to take account of the newest discoveries, On the Track of Unknown Animals is both a popular introduction to cryptozoology and a scientific presentation of hidden animals. The striking progress of cryptozoology is illustrated by the fact that in the past 12 years alone, some 40 spectacular new animal species have been discovered and described to science, and this book presents evidence of numerous others. Cryptozoology is certainly one of the most compelling of the new sciences, a great adventure in the quest for knowledge.