They [vampire bats] roost extremely close to each other and they groom each other—both characteristics that favor transfer of vampiricides between individuals and that make it unnecessary to treat more than a few members of each roost.
Source: wiktionary
In addition, and related to the increase in extensive cattle raising, the use of vampiricides—substances that are used to kill vampire bats—also has increased.
Source: wiktionary
Despite the widespread use of vampiricide for at least 50 years, astonishingly few investigators have tested whether culling vampire bats reduces rabies virus cases in livestock.
Source: wiktionary
Some manuals on the proper method for vampiricide give explicit instructions that this stake be fashioned from the wood identical to that used in Christ's cross (though some debate arises regarding exactly what type of wood that is).
Source: wiktionary
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