“With the Entomologist perk, you do an additional +50% damage every time you attack a mutated insect, like the radroach, giant ant, or radscorpion.”— Fallout 3 in-game description
This perk allows for expanded dialogue options when speaking with other entomologists, especially in the quest Those!
Despite it appearing early in the player character's perk choices, the player character will find that giant radscorpions, encountered very often later in the game, are difficult to kill in one round of V.A.T.S. without the perk.
Abominable ·Animal Control ·The Bear-Slayer ·Beautiful Beatdown ·Brainless/Big Brained ·Bug Stomper ·Camel of the Mojave ·Coin Operator ·Day Tripper ·Dead Man's Burden ·Dine and Dash ·Divide Survivor ·DNAgent ·DNAvenger ·Elijah's Ramblings ·Fast Times ·Free Radical ·Friendly Help ·Ghost Hunter ·Heartless/Cardiac Arrest ·Lonesome Road ·Lord Death ·Machine Head ·Marked ·Meat of Champions ·Melee Hacker ·Mutant Massacrer ·Power Armor Training ·Scourge of the East ·Set Lasers for Fun ·Sierra Madre Martini ·Spineless/Reinforced Spine ·Tough Guy