Ghoul Ecology

Ghoul Ecology is a perk added to Fallout 3 in the Point Lookout add-on.

Obtaining
The perk is gained by reading Plik's journal inside the Coastal Grotto.

Note
All your weapons will also do an additional 5 damage against Ghouls.

Glitched?
Some players have reported select weapons greatly increasing in damage after receiving this perk. A fully repaired Eugene with 100 big guns skill was raised from 110 damage to 255. Similar effects happened to the Flamer, Chinese Assault Rifle, and Gatling Laser. It is speculated that the glitch adds 5-10 damage per bullet regardless of enemy, Thus rapidfire weapons benifit most.