and they later made appearances in the final three Dark Tower books. Description Characteristics Marvel's Dark Tower Almanac describes the can-toi as being the results of human/taheen interspecies mating, and that they tend to exhibit "the most undesirable characteristics of both species". Unlike the taheen, which have the heads of various animals, the can-toi always have the heads of deformed rats. The can-toi have extremely poor hygiene (many are infested with fleas and lice), and many carr… (More on Can-toi)