It was in 1981 when this very interesting book was published in Mexico for the first time, although the translated edition does not come to Spain until 1987, in which I read first. Undoubtedly, it was the first treaty of cryptozoology that fell into my hands and I assure you that with each page a feeling of discovering a new "world" filled with mystery and terrible creatures came into my imagination. We can find in this volume tell us stories of three meters semi-human creatures, discover the possible origin of the famous Yeti Neanderthal, fish that climb trees, the graves of "giants" of Patagonia and the Andes and an incredible list of all kinds of strange creatures. Certainly its author, John Alva Keel a ufologist atypical in during the 60's and 70's broke into the literary market, causing a before and after the treatment of these issues, like the UFO (its real specialty) situation that still stands today. It is unfortunate that, although the name is widely known Keel for Spanish-speaking readers can not be said the same about his complete works, little known but highly desired in many countries. No doubt this will be an interesting possibility for details on the innovative, bold and suggestive rather than thinking of this man, considered a true "historic" of ufology and strange phenomena.
John A. Kell