Ghoul Ecology

Ghoul Ecology is a perk added to Fallout 3 in the Point Lookout add-on. All your weapons do an additional 5 damage against ghouls.

Obtaining
The perk is gained by reading Plik's journal inside the Coastal Grotto. The book itself is located on a table inside Plik's bedroom next to a Mini Nuke and a Chessboard.

Bugs
Due to a misplaced condition, damage is applied to all enemies. The condition is placed into the conditions list used for perks that are selectable at level-up, instead of in the Perk Entry's Target condition where it belongs.(which simply means that the damage is not placed on the ghouls like the Entomologist perk does against insects, but instead the damage is added to you weapons based on amount of ammo used per round of V.A.T.S. attacks so hunting rifles get +5 and chinese assault rifle which shoot 3 times at once get an bonus of +15, this can be a usefull bug for Big Guns since Minigun fires 8 times so you get an bonus of +40 damage.