Ley had written a number of books containing scientific oddities; Exotic Zoology collects the cryptozoological matter from those books. Throughout the book he shows examples of organisms that were rumored to exist, or were thought to be impossible, that were shown to be real; and others that were accepted as fact, that were discovered to have never existed: "He speculates about dragons and sea serpents, wingless birds and Abominable Snowmen." The book, in its description of (fictional) peoples and creatures, has been compared to John Mandeville's Travels. Some of the claims have been criticized or ridiculed, for instance the statement that giant squids had left scars on whales of two feet in diameter.
- Stein, Gordon (1996). The encyclopedia of the paranormal. Prometheus Books. p. 200. ISBN 978-1-57392-021-6.
- Coleman, Loren; Jerome Clark (1999). Cryptozoology A to Z: the encyclopedia of loch monsters, Sasquatch, Chupacabras, and other authentic mysteries of nature. Simon and Schuster. p. 20. ISBN 978-0-684-85602-5.
- Bille, Matthew A. (2006). Shadows of existence: discoveries and speculations in zoology. Hancock House. p. 216. ISBN 978-0-88839-612-9.
- "Rev. of Exotic Zoology". Saturday Review. 50: 41. 1967. Retrieved 1 February 2011.
- Preece, Rod (1999). Animals and nature: cultural myths, cultural realities. UBC Press. p. 277. ISBN 978-0-7748-0724-1.
- Ellis, Richard (2006). Monsters of the Sea. Globe Pequot. p. 252. ISBN 978-1-59228-967-7.
- Ellis, Richard (1999). The search for the giant squid. Penguin. p. 142. ISBN 978-0-14-028676-2.
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