A discovery from TMDB

Bats

An alien virus that once wiped civilizations out in ancient times through out time has returned overnight by a mysterious thunderstorm infecting all the bats in the area causing them grow into grotesque giant carnivore man-eater monster bats and it's up to humankind to fight for their lives to survive or history will once again repeat it's self as it has thousands of years ago.

Directed by Becca Hirani, Scott Chambers