Of the many books that Jon Downes, Director of the Center for Fortean Zoology, has written, there can be no doubt at all that the one which provokes most interest is The Owlman and Others.
The book tells the story of a diabolical, winged monstrosity seen deep in the woods of darkest Cornwall, England in 1976, and that some perceive as being the closest thing that us Brits have to Mothman.
Originally published a decade ago, last year the CFZ put out a new edition of the book that is packed with new, up-dated and intriguing data.
And for those of you who are already aware of the story and Jon's book, or those of you that want to know more about the mystery beast, Tulpa, phantom or whatever it may really be, I would also strongly urge you to read the article Cornish Cryptids by Kithra, and which can be found here.
The article provides an excellent overview of the case and the theories, as well as some good photographs of the area where all of the high-strangeness took place.
Kithra also reveals details of other encounters with large, winged entities in the UK that are both intriguing and worthy of follow-up.