"the bloodbat flailed and sat upon his chest and righted itself again and hissed and clicked its teeth"
Common Vampire Bat (Desmodus rotundus)
Creative Commons Attribution Share AlikeCommon Vampire Bat (Desmodus rotundus) - Credit: Ltshears

There are three bat species (commonly known as Vampire Bats) that feed solely on blood: the Common Vampire Bat (Desmodus rotundus), the Hairy-legged Vampire Bat (Diphylla ecaudata), and the White-winged Vampire Bat (Diaemus youngi). All three species are native to the Americas, ranging from Mexico to Brazil, Chile, and Argentina.

Whereas both the Hairy-legged and White-winged Vampire Bat prefer to feed on the blood of birds, the Common Vampire Bat feeds mostly on the blood of mammals (including humans). It is this latter bat which the unfortunate Sproule falls victim to.