Kill the Mutant Giant Bats

Kill the Mutant Giant Bats was going to be a quest in Van Buren, the canceled Fallout 3 by Black Isle Studios.

Background
Mutant bats live in one of the Blackfoot caves, and are attacking the Blackfoots during the day.

The bats aren't much of a threat to the player character (they'd rather eat fruit and bugs). If killed off anyway, then manti swarms become possible as a random encounters near the town, and the float text of the Blackfoots in town mention the increased number of mantis from time to time.

Character type completion breakdown

 * 1) CombatBoy - Kills!
 * 2) ScienceBoy - Can poison them!
 * 3) DiploBoy - Can talk some younger tribals to help him kill the relatively harmless giant bats!
 * 4) Stealth Boy - Can sneak about the bat lair during the day and is less likely to wake them all up when murdering sleeping bats!

Source

 * Blackfoot design document