This movie's fun, if based on a questionable premise. We have the stereotypical Menace -- in this case, vampire bats -- who have to be exterminated before they Get Us All, and the pivotal character is an American Indian cop.
A tribal elder on a reservation is apparently behind the appearance of the bats, as he apparently shamanistically summoned them to "end the world." This because sacred grounds are being threatened by an industrialist, who wants to exploit resources.
Now, a word of reality here: movies to the contrary, real Vampire Bats don't suck blood. They evolved from fruit bats, and they nip their sleeping victims and lap the blood. The astonishing thing is that they do this without waking their victims. Their bite and anticoagulant saliva are being studied by medical institutions for new technological advances (in surgery and anesthesiology). They're neither aggressive nor dangerous.
Nonetheless, the movie bats are a menace, and a force of nature. The film reaches a satisfactory ending, which solved the problem set up by the industrialist, too. Fun, but not to be taken seriously.
