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.

Bugs
Some players have reported automatic weapons greatly increasing in damage after receiving this perk. A fully repaired Eugene with 100 big guns skill can be raised from 110 damage to 255. It is likely that the glitch adds 5 damage per bullet regardless of enemy, thus automatic weapons benefit the most. This glitch has also been observed when taking the Superior Defender perk.