Mostly speculation

Chad Arment's book "Cryptozoology" is probably not a good introduction to the subject for neophytes. More advanced practitioners of the craft might find it useful.

Personally, I found the section entitled "Speculation" to be the most interesting, since it contains discussions about lesser known cryptids: long-tailed bobcats, "boss" snakes, giant orangutans (thankfully only in Indonesia!), the great naked bear and a string of old Bigfoot reports, more or less believable. Some outright hoaxes have also been included, perhaps as a service to future researchers?

The advice in the "Science" section is pretty basic common sense (bring a tape recorder, don't ask leading questions, beware of Bigfoot, etc). Arment rejects both sceptics who claim that cryptozoology is unfeasable, and paranormal researchers who claim that the "animals" seen are really supernatural entities. The author believes that a cryptid, if real at all, is a flesh-and-blood animal. He seems to admit, however, that cryptozoologists mostly collect and study *reports* of unknown animals, i.e. purported observations. Arment is aware that this doesn't constitute scientific proof of the phenomenon. The hunt continues, and the book ends with an appendix featuring an article by Ivan Sanderson on how to obtain (hunt down) large biological specimens...

Not the most exciting cryptozoology book around, but probably good for the reference section of your private library, if you're at all interested in this line of investigation.