Academician Shen, through his investigation and observation of some "Blood-eating Creatures", as well as other researcher's data he had acquired, wrote a document titled "The Influence of Blood Source Type on the Mutation of 'Blood-eating Creatures'".
In that document, Academician Shen believes that when "Blood-eating Creatures" first start mutating, if the blood source is the same species as the creature before mutation, then the creature would achieve the maximum improvement during the initial stage of mutation. It may even acquire abilities or characteristics that can be applied to other members of the same species before mutation,—except for creatures that were plants before becoming "Blood-eating Creatures".
Moreover, if the blood source remains the same as the original species, the physical mutation will be relatively small, making it easier to hide within their original groups.
