Entomologist (Fallout 3)

Entomologist is a perk in Fallout 3 and Fallout: New Vegas.

Fallout 3
With this perk, the Lone Wanderer inflicts 50% more Damage when attacking every radroach, giant ant, bloatfly or radscorpion.

Fallout: New Vegas
With this perk, the Courier inflicts 50% more Damage when attacking any cazador, radscorpion, radroach, giant ant, mantis or bloatfly.