Bats

Bats are little rodents with wings. They are as blind as... well... as bats, and navigate through darkened areas via a sonar process called echolocation, which involves emitting sound that vibrates off surrounding obstacles, sending a signal back alerting the bat to its surroundings. People seem to have a natural and healthy fear of bats. This could be because they are known to carry various diseases like rabies, but there is always the possibility that the bat in your vicinity may also be a vampire.