Giant Bat

The Giant Bat is an irregular mutant that appears in Resident Evil Zero. Once an ordinary bat, it became infected with the T-Virus after the clone of James Marcus caused an outbreak at the Umbrella Research Center.

History
During the Ecliptic Express incident, S.T.A.R.S. member Rebecca Chambers and ex-Marine Billy Coen escaped from the Umbrella Management Training Facility and proceeded towards the adjacent laboratory. Entering a small chapel, they were attacked by a giant mutated bat, which had grown so large that it was able to pick an adult human up off the ground. The giant bat could also emit a shriek that would summon smaller infected bats to assist it, attacking Billy and Rebecca in its stead. Rebecca and Billy managed to kill the creature with what firearms they had and proceeded into the lab facility.