What would be the point of including the unicorn in a study of animals like this:
https://drive.google.com/file/d/0BwuhtWGMSK8dSV84YkloenUxMnc/view?usp=sharing
Quoted as: 8. The UNICORN, a Beast which, tho* doubted. of by many Writers, yet is by others thus described : He has but one Horn, and that an exceeding rich one, growing out of the Middle of his Forehead. His Head resembles an Hart's, his Feet an Elephant's, his Tail a Boar's, and the. rest of his Body an Horse's. The Horn is about a Foot and a half in Length. His Voice is like the Lowing of an Ox. His Mane and Hair a-e of a yellowish Colour. His Horn is as hard as Iron, and as rough as any File, twisted or curled like a flaming Sword ; very straight, sharp, and every where black, excepting the Point. Great Virtues are attributed to it, in expelling of Poison, and curing of several Diseases. He is not a Beast of Prey.
Edit: Also noticed they included the manticore and another animal I cant identify, the lamia.
First of all, it is important to point out that the unicorn does not figure into traditional folklore: in other words, it does not appear in legendary material (stories to be believed) nor does it appear in the fictional folktale (the oral novels of the folk). The unicorn appears in medieval literature and in bestiaries, as an intellectual construct. So many extraordinary things - giants, dragons, mermaids, fairies, ghosts, for example - were part of folklore, believed to exist by the folk and then drawn into literature, but the unicorn does not follow that path. Instead, it was born of the intelligentsia and it did not diffuse to the folk.
There may have been (and probably were) educated people who accepted reports of unicorns as existing in exotic locations, but the folk did not believe in them nor were they likely to know of them except as the creature occasionally figured into art that people might see.
As a side note, the unicorn occasionally appears in fantasy literature and film, but it does not normally appear in the work of authors (such as Tolkien) who remained true to the original folk belief, where the creature was an alien. When the unicorn does appear, one can be fairly certain that the author does not draw upon pristine folklore but rather is toying with intellectual concepts and/or is drawing upon secondary literature rather than the primary source.