Do vampire bats drink human blood?

yes they do drink human blood and no they do not. Yes because that is only if their is no other food around. No because even if they do bite you then it is only a small bite on the big toe.

+++ Best keep your boots on then. I'm not aware of any vampire-bats biting humans normally - though they would try to bite in self-defence if handled roughly. They feed by lapping up the blood oozing from tiny bites. The risk is not from the small blood loss but from carried diseases including possibly rabies.