Crow then go with that as an answer for you... This is a book, that you as an individual have the right to read or not, but it is far from the authers responseability to confirm facts when there is none and this is clearly stated on multiple occations... So enjoy the story for the story for this is not research work in the least, it is entertainment and should be looked at it in that realm...
I think about it frequently, and I find your viewpoint puzzling. Are you here merely to gain amusement from those of us that give some credence to the possibility the creature could exist? If so, I hope a few fleas find you, as I would find amusement in that.