Super Mutant Behemoth (Fallout 3)

Super Mutant Behemoths are a variant of Super Mutant found throughout the Capital Wasteland

Background
There are only five behemoths found in game, although reports of their sightings continue through dialogue among the Brotherhood of Steel. Killing all five behemoths will unlock the achievement/trophy, The Bigger They Are.

Appearances
Super Mutant Behemoths appear in Fallout 3.