Maybe this will help ......
Bats have had a bad rap throughout the centuries. In more superstitious times, people created stories of a crinkly, ugly animal that flew through the night. They imagined them in the caliber of ghosts evil spirits, and vampires (from the Serbian word wampir) bloodsucking ghosts, dead men�s souls who left their corpses at night to take blood from sleeping victims. Years later, the bat scientifically known as desmontidae was labeled the vampire bat by a French naturalist Buffon. In 1749, he published Natural History, in which he quoted the testimony of travelers and naturalists, as well as his own experience, he implied that these bats suck the blood of humans. Now we know that the vampire bat rarely attacks man. They will, however, attack large animals such as cattle and horses. They do this by selecting a sparsely haired spot on the animal and making a small, superficial bite in its skin with its incisors. They then gorge themselves on the blood that oozes from this wound, sucking it through a tube-like space formed between the tongue and the notched lower lip. Desmodontids have 20 to 26 teeth, with a single pair of large, sharp incisors. Contrary to the legend of the vampire, this wound is small and the animal often does not even realize it has been bitten. The danger from the vampire bat lies in the slow healing of the wound, which can be conducive to infection and parasitic worms, and the transmission of rabies.